309129878976 has 56 divisors (see below), whose sum is σ = 866018273040. Its totient is φ = 96981921792.

The previous prime is 309129878969. The next prime is 309129878999. The reversal of 309129878976 is 679878921903.

It is a super-2 number, since 2×309129878976² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 309129878976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47351191 + ... + 47357718.

Almost surely, 2^309129878976 is an apocalyptic number.

It is an amenable number.

309129878976 is an abundant number, since it is smaller than the sum of its proper divisors (556888394064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309129878976 is a wasteful number, since it uses less digits than its factorization.

309129878976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94708941 (or 94708931 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 69.

The spelling of 309129878976 in words is "three hundred nine billion, one hundred twenty-nine million, eight hundred seventy-eight thousand, nine hundred seventy-six".