78669136 has 80 divisors (see below), whose sum is σ = 190487808. Its totient is φ = 30643200.

The previous prime is 78669127. The next prime is 78669163. The reversal of 78669136 is 63196687.

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, 102996 + ... + 103756.

Almost surely, 2^78669136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78669136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95243904).

78669136 is an abundant number, since it is smaller than the sum of its proper divisors (111818672).

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

78669136 is a wasteful number, since it uses less digits than its factorization.

78669136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 854 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 78669136 is about 8869.5623341854. The cubic root of 78669136 is about 428.4841814355.

The spelling of 78669136 in words is "seventy-eight million, six hundred sixty-nine thousand, one hundred thirty-six".