79987138 has 64 divisors (see below), whose sum is σ = 156930048. Its totient is φ = 29675520.

The previous prime is 79987129. The next prime is 79987147. The reversal of 79987138 is 83178997.

It is an interprime number because it is at equal distance from previous prime (79987129) and next prime (79987147).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311106 + ... + 311362.

It is an arithmetic number, because the mean of its divisors is an integer number (2452032).

Almost surely, 2^79987138 is an apocalyptic number.

79987138 is a deficient number, since it is larger than the sum of its proper divisors (76942910).

79987138 is a wasteful number, since it uses less digits than its factorization.

79987138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367.

The product of its digits is 762048, while the sum is 52.

The square root of 79987138 is about 8943.5528734391. The cubic root of 79987138 is about 430.8638448196.

The spelling of 79987138 in words is "seventy-nine million, nine hundred eighty-seven thousand, one hundred thirty-eight".