78131164 has 12 divisors (see below), whose sum is σ = 136962000. Its totient is φ = 38999168.

The previous prime is 78131149. The next prime is 78131171. The reversal of 78131164 is 46113187.

It is a super-2 number, since 2×78131164² = 12208957575989792, 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, 13909 + ... + 18700.

It is an arithmetic number, because the mean of its divisors is an integer number (11413500).

Almost surely, 2^78131164 is an apocalyptic number.

It is an amenable number.

78131164 is a deficient number, since it is larger than the sum of its proper divisors (58830836).

78131164 is a wasteful number, since it uses less digits than its factorization.

78131164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33212 (or 33210 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 78131164 is about 8839.1834464502. The cubic root of 78131164 is about 427.5052293514.

The spelling of 78131164 in words is "seventy-eight million, one hundred thirty-one thousand, one hundred sixty-four".