78539972 has 48 divisors (see below), whose sum is σ = 160672512. Its totient is φ = 32901120.

The previous prime is 78539959. The next prime is 78540031. The reversal of 78539972 is 27993587.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78539972.

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 15 ways as a sum of consecutive naturals, for example, 325772 + ... + 326012.

It is an arithmetic number, because the mean of its divisors is an integer number (3347344).

Almost surely, 2^78539972 is an apocalyptic number.

It is an amenable number.

78539972 is an abundant number, since it is smaller than the sum of its proper divisors (82132540).

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

78539972 is a wasteful number, since it uses less digits than its factorization.

78539972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 466 counting only the distinct ones).

The product of its digits is 952560, while the sum is 50.

The square root of 78539972 is about 8862.2780367127. The cubic root of 78539972 is about 428.2495487668.

The spelling of 78539972 in words is "seventy-eight million, five hundred thirty-nine thousand, nine hundred seventy-two".