78518992 has 10 divisors (see below), whose sum is σ = 152130578. Its totient is φ = 39259488.

The previous prime is 78518983. The next prime is 78519031. The reversal of 78518992 is 29981587.

It can be written as a sum of positive squares in only one way, i.e., 57395776 + 21123216 = 7576^2 + 4596^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2453703 + ... + 2453734.

Almost surely, 2^78518992 is an apocalyptic number.

It is an amenable number.

78518992 is a deficient number, since it is larger than the sum of its proper divisors (73611586).

78518992 is a wasteful number, since it uses less digits than its factorization.

78518992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4907445 (or 4907439 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 78518992 is about 8861.0942890819. The cubic root of 78518992 is about 428.2114132992.

The spelling of 78518992 in words is "seventy-eight million, five hundred eighteen thousand, nine hundred ninety-two".