78555664 has 40 divisors (see below), whose sum is σ = 171774720. Its totient is φ = 34473600.

The previous prime is 78555647. The next prime is 78555677. The reversal of 78555664 is 46655587.

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 7 ways as a sum of consecutive naturals, for example, 2592 + ... + 12799.

It is an arithmetic number, because the mean of its divisors is an integer number (4294368).

Almost surely, 2^78555664 is an apocalyptic number.

It is an amenable number.

78555664 is an abundant number, since it is smaller than the sum of its proper divisors (93219056).

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

78555664 is a wasteful number, since it uses less digits than its factorization.

78555664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15439 (or 15433 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 46.

The square root of 78555664 is about 8863.1633179131. The cubic root of 78555664 is about 428.2780677669.

The spelling of 78555664 in words is "seventy-eight million, five hundred fifty-five thousand, six hundred sixty-four".