78639360 has 72 divisors (see below), whose sum is σ = 251166720. Its totient is φ = 20969472.

The previous prime is 78639359. The next prime is 78639361. The reversal of 78639360 is 6393687.

It is an interprime number because it is at equal distance from previous prime (78639359) and next prime (78639361).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78639361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6400 + ... + 14079.

Almost surely, 2^78639360 is an apocalyptic number.

It is an amenable number.

78639360 is an abundant number, since it is smaller than the sum of its proper divisors (172527360).

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

78639360 is a wasteful number, since it uses less digits than its factorization.

78639360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20503 (or 20489 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 78639360 is about 8867.8836257587. The cubic root of 78639360 is about 428.4301146792.

The spelling of 78639360 in words is "seventy-eight million, six hundred thirty-nine thousand, three hundred sixty".