78178164 has 24 divisors (see below), whose sum is σ = 183018528. Its totient is φ = 25973280.

The previous prime is 78178153. The next prime is 78178169. The reversal of 78178164 is 46187187.

It is a happy number.

78178164 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×78178164² = 12223650652821792, which contains 22 as substring.

78178164 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78178169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6927 + ... + 14294.

It is an arithmetic number, because the mean of its divisors is an integer number (7625772).

Almost surely, 2^78178164 is an apocalyptic number.

It is an amenable number.

78178164 is an abundant number, since it is smaller than the sum of its proper divisors (104840364).

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

78178164 is a wasteful number, since it uses less digits than its factorization.

78178164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21535 (or 21533 counting only the distinct ones).

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

The square root of 78178164 is about 8841.8416633640. The cubic root of 78178164 is about 427.5909344535.

The spelling of 78178164 in words is "seventy-eight million, one hundred seventy-eight thousand, one hundred sixty-four".