79215864 has 256 divisors, whose sum is σ = 270950400. Its totient is φ = 18703872.

The previous prime is 79215839. The next prime is 79215893. The reversal of 79215864 is 46851297.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 954367 + ... + 954449.

It is an arithmetic number, because the mean of its divisors is an integer number (1058400).

Almost surely, 2^79215864 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 79215864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135475200).

79215864 is an abundant number, since it is smaller than the sum of its proper divisors (191734536).

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

79215864 is a wasteful number, since it uses less digits than its factorization.

79215864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 150 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 79215864 is about 8900.3294321053. The cubic root of 79215864 is about 429.4745049902.

The spelling of 79215864 in words is "seventy-nine million, two hundred fifteen thousand, eight hundred sixty-four".