78817164 has 12 divisors (see below), whose sum is σ = 183906744. Its totient is φ = 26272384.

The previous prime is 78817127. The next prime is 78817199. The reversal of 78817164 is 46171887.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 3284037 + ... + 3284060.

It is an arithmetic number, because the mean of its divisors is an integer number (15325562).

Almost surely, 2^78817164 is an apocalyptic number.

It is an amenable number.

78817164 is an abundant number, since it is smaller than the sum of its proper divisors (105089580).

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

78817164 is a wasteful number, since it uses less digits than its factorization.

78817164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568104 (or 6568102 counting only the distinct ones).

The product of its digits is 75264, while the sum is 42.

The square root of 78817164 is about 8877.9031308074. The cubic root of 78817164 is about 428.7527658649.

The spelling of 78817164 in words is "seventy-eight million, eight hundred seventeen thousand, one hundred sixty-four".