309428064 has 72 divisors (see below), whose sum is σ = 959940072. Its totient is φ = 93765120.

The previous prime is 309428059. The next prime is 309428087. The reversal of 309428064 is 460824903.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45669 + ... + 52004.

It is an arithmetic number, because the mean of its divisors is an integer number (13332501).

Almost surely, 2^309428064 is an apocalyptic number.

It is an amenable number.

309428064 is an abundant number, since it is smaller than the sum of its proper divisors (650512008).

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

309428064 is a wasteful number, since it uses less digits than its factorization.

309428064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97700 (or 97689 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 309428064 is about 17590.5674723700. The cubic root of 309428064 is about 676.3734733536.

The spelling of 309428064 in words is "three hundred nine million, four hundred twenty-eight thousand, sixty-four".