79515870 has 64 divisors (see below), whose sum is σ = 220907520. Its totient is φ = 17941248.

The previous prime is 79515859. The next prime is 79515871. The reversal of 79515870 is 7851597.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79515871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14194 + ... + 18986.

It is an arithmetic number, because the mean of its divisors is an integer number (3451680).

Almost surely, 2^79515870 is an apocalyptic number.

79515870 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 79515870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110453760).

79515870 is an abundant number, since it is smaller than the sum of its proper divisors (141391650).

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

79515870 is a wasteful number, since it uses less digits than its factorization.

79515870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4889.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 79515870 is about 8917.1671510632. The cubic root of 79515870 is about 430.0159900309.

The spelling of 79515870 in words is "seventy-nine million, five hundred fifteen thousand, eight hundred seventy".