79981087 has 8 divisors (see below), whose sum is σ = 82254800. Its totient is φ = 77770152.

The previous prime is 79981079. The next prime is 79981103. The reversal of 79981087 is 78018997.

It is not a de Polignac number, because 79981087 - 2³ = 79981079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79981087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79981387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49864 + ... + 51442.

It is an arithmetic number, because the mean of its divisors is an integer number (10281850).

Almost surely, 2^79981087 is an apocalyptic number.

79981087 is a deficient number, since it is larger than the sum of its proper divisors (2273713).

79981087 is an frugal number, since it uses more digits than its factorization.

79981087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690 (or 1616 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 79981087 is about 8943.2145786624. The cubic root of 79981087 is about 430.8529796441.

The spelling of 79981087 in words is "seventy-nine million, nine hundred eighty-one thousand, eighty-seven".