78109164 has 48 divisors (see below), whose sum is σ = 231436800. Its totient is φ = 22316688.

The previous prime is 78109139. The next prime is 78109177. The reversal of 78109164 is 46190187.

It is a super-2 number, since 2×78109164² = 12202083001557792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50904 + ... + 52415.

It is an arithmetic number, because the mean of its divisors is an integer number (4821600).

Almost surely, 2^78109164 is an apocalyptic number.

It is an amenable number.

78109164 is an abundant number, since it is smaller than the sum of its proper divisors (153327636).

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

78109164 is a wasteful number, since it uses less digits than its factorization.

78109164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103339 (or 103331 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 78109164 is about 8837.9388999925. The cubic root of 78109164 is about 427.4651002596.

The spelling of 78109164 in words is "seventy-eight million, one hundred nine thousand, one hundred sixty-four".