309720076 has 12 divisors (see below), whose sum is σ = 573893208. Its totient is φ = 145750592.

The previous prime is 309720067. The next prime is 309720091. The reversal of 309720076 is 670027903.

309720076 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277286 + ... + 2277421.

It is an arithmetic number, because the mean of its divisors is an integer number (47824434).

Almost surely, 2^309720076 is an apocalyptic number.

309720076 is the 11131-st centered pentagonal number.

It is an amenable number.

309720076 is a deficient number, since it is larger than the sum of its proper divisors (264173132).

309720076 is a wasteful number, since it uses less digits than its factorization.

309720076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554728 (or 4554726 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 309720076 is about 17598.8657589062. The cubic root of 309720076 is about 676.5861744576.

Adding to 309720076 its reverse (670027903), we get a palindrome (979747979).

The spelling of 309720076 in words is "three hundred nine million, seven hundred twenty thousand, seventy-six".