Dow Jones 30 Industrial Index , DJIA 50,872.11 +86.10 +0.17% 04:20:01 PM EDT Add to watchlist Properties of 30: prime decomposition, primality test, divisors, arithmetic properties, and conversion in binary, octal, hexadecimal, etc. Here are some math facts about the number 30: The number 30 is an even number – the 15th even number. The number 30 has 8 factors which are 1, 2, 3, 5, 6, 10,15 and 30. The number of days in the months April, June, September and November (and in unusual circumstances February—see February 30). Although the number of days in a month vary, 30 is used to estimate months elapsing. 30 is the first sphenic number, that is the smallest number with 3 distinct prime divisors 30 is the largest number with the property that all smaller numbers relatively prime to it are prime. But, almost two years after much of it was completed, Adele did release 30. And remarkably, considering the world has been using her back catalog to channel its rawest emotions since 2008, this is easily Adele’s most vulnerable record. The follow-up singles, Oh My God and I Drink Wine , charted in the UK chart's top five simultaneously with it. 30 received acclaim from music critics, who emphasised Adele's vocal performance. 30 is the index number for Fibonacci number, F 30 = 832040 = 5∗11∗23∗31∗61 = the largest Fibonacci number with 6 digits. 30 is the smallest integer with three distinct prime divisors. 30 is the name of the long-awaited fourth studio album by British singer-songwriter, Adele, released on November 19, 2021. With that water-treading sequel, she’d zigged to making the weakest of her four albums. With “30,” she’s zagged to a richer, more compelling collection that feels like her best.