79987872 has 48 divisors (see below), whose sum is σ = 221024160. Its totient is φ = 25258752.

The previous prime is 79987837. The next prime is 79987877. The reversal of 79987872 is 27878997.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (79987877) 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, 20103 + ... + 23750.

It is an arithmetic number, because the mean of its divisors is an integer number (4604670).

Almost surely, 2^79987872 is an apocalyptic number.

It is an amenable number.

79987872 is an abundant number, since it is smaller than the sum of its proper divisors (141036288).

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

79987872 is a wasteful number, since it uses less digits than its factorization.

79987872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43885 (or 43877 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 57.

The square root of 79987872 is about 8943.5939084911. The cubic root of 79987872 is about 430.8651627527.

The spelling of 79987872 in words is "seventy-nine million, nine hundred eighty-seven thousand, eight hundred seventy-two".