309642672 has 40 divisors (see below), whose sum is σ = 802917360. Its totient is φ = 102826240.

The previous prime is 309642667. The next prime is 309642691. The reversal of 309642672 is 276246903.

309642672 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 309642672.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922 + ... + 24902.

It is an arithmetic number, because the mean of its divisors is an integer number (20072934).

Almost surely, 2^309642672 is an apocalyptic number.

It is an amenable number.

309642672 is an abundant number, since it is smaller than the sum of its proper divisors (493274688).

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

309642672 is a wasteful number, since it uses less digits than its factorization.

309642672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24261 (or 24255 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 309642672 is about 17596.6665024942. Note that the first 3 decimals coincide. The cubic root of 309642672 is about 676.5298065266.

The spelling of 309642672 in words is "three hundred nine million, six hundred forty-two thousand, six hundred seventy-two".