78723864 has 96 divisors (see below), whose sum is σ = 226746000. Its totient is φ = 24627456.

The previous prime is 78723839. The next prime is 78723941. The reversal of 78723864 is 46832787.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76747 + ... + 77765.

Almost surely, 2^78723864 is an apocalyptic number.

78723864 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78723864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113373000).

78723864 is an abundant number, since it is smaller than the sum of its proper divisors (148022136).

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

78723864 is a wasteful number, since it uses less digits than its factorization.

78723864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1090 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 78723864 is about 8872.6469556722. The cubic root of 78723864 is about 428.5835200398.

The spelling of 78723864 in words is "seventy-eight million, seven hundred twenty-three thousand, eight hundred sixty-four".