78537992 has 16 divisors (see below), whose sum is σ = 158586540. Its totient is φ = 36248256.

The previous prime is 78537989. The next prime is 78538007. The reversal of 78537992 is 29973587.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78039556 + 498436 = 8834^2 + 706^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78537992.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377483 + ... + 377690.

Almost surely, 2^78537992 is an apocalyptic number.

It is an amenable number.

78537992 is an abundant number, since it is smaller than the sum of its proper divisors (80048548).

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

78537992 is a wasteful number, since it uses less digits than its factorization.

78537992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755192 (or 755188 counting only the distinct ones).

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

The square root of 78537992 is about 8862.1663265818. The cubic root of 78537992 is about 428.2459499996.

The spelling of 78537992 in words is "seventy-eight million, five hundred thirty-seven thousand, nine hundred ninety-two".