78911864 has 32 divisors (see below), whose sum is σ = 160780800. Its totient is φ = 36171360.

The previous prime is 78911849. The next prime is 78911867. The reversal of 78911864 is 46811987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78911867) 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, 3662 + ... + 13085.

It is an arithmetic number, because the mean of its divisors is an integer number (5024400).

Almost surely, 2^78911864 is an apocalyptic number.

It is an amenable number.

78911864 is an abundant number, since it is smaller than the sum of its proper divisors (81868936).

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

78911864 is a wasteful number, since it uses less digits than its factorization.

78911864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16803 (or 16799 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 78911864 is about 8883.2349963288. The cubic root of 78911864 is about 428.9244147547.

The spelling of 78911864 in words is "seventy-eight million, nine hundred eleven thousand, eight hundred sixty-four".