78517868 has 36 divisors (see below), whose sum is σ = 162664320. Its totient is φ = 32941920.

The previous prime is 78517853. The next prime is 78517897. The reversal of 78517868 is 86871587.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 53 + ... + 12531.

Almost surely, 2^78517868 is an apocalyptic number.

It is an amenable number.

78517868 is an abundant number, since it is smaller than the sum of its proper divisors (84146452).

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

78517868 is a wasteful number, since it uses less digits than its factorization.

78517868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12518 (or 12505 counting only the distinct ones).

The product of its digits is 752640, while the sum is 50.

The square root of 78517868 is about 8861.0308655370. The cubic root of 78517868 is about 428.2093700062.

The spelling of 78517868 in words is "seventy-eight million, five hundred seventeen thousand, eight hundred sixty-eight".