78164864 has 32 divisors (see below), whose sum is σ = 156296640. Its totient is φ = 38937600.

The previous prime is 78164839. The next prime is 78164887. The reversal of 78164864 is 46846187.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×78164864² = 12219491928276992, which contains 22 as substring.

It is a congruent number.

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, 39089 + ... + 41039.

It is an arithmetic number, because the mean of its divisors is an integer number (4884270).

Almost surely, 2^78164864 is an apocalyptic number.

It is an amenable number.

78164864 is a deficient number, since it is larger than the sum of its proper divisors (78131776).

78164864 is a wasteful number, since it uses less digits than its factorization.

78164864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278 (or 2266 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 78164864 is about 8841.0895256184. The cubic root of 78164864 is about 427.5666852188.

The spelling of 78164864 in words is "seventy-eight million, one hundred sixty-four thousand, eight hundred sixty-four".