78793864 has 16 divisors (see below), whose sum is σ = 149763420. Its totient is φ = 38856960.

The previous prime is 78793829. The next prime is 78793873. The reversal of 78793864 is 46839787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78676900 + 116964 = 8870^2 + 342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66877 + ... + 68044.

Almost surely, 2^78793864 is an apocalyptic number.

It is an amenable number.

78793864 is a deficient number, since it is larger than the sum of its proper divisors (70969556).

78793864 is a wasteful number, since it uses less digits than its factorization.

78793864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135000 (or 134996 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The square root of 78793864 is about 8876.5907870083. The cubic root of 78793864 is about 428.7105122765.

The spelling of 78793864 in words is "seventy-eight million, seven hundred ninety-three thousand, eight hundred sixty-four".