79987855 has 4 divisors (see below), whose sum is σ = 95985432. Its totient is φ = 63990280.

The previous prime is 79987837. The next prime is 79987877. The reversal of 79987855 is 55878997.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79987855 - 2²³ = 71599247 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 79987855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7998781 + ... + 7998790.

It is an arithmetic number, because the mean of its divisors is an integer number (23996358).

Almost surely, 2^79987855 is an apocalyptic number.

79987855 is a deficient number, since it is larger than the sum of its proper divisors (15997577).

79987855 is a wasteful number, since it uses less digits than its factorization.

79987855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15997576.

The product of its digits is 6350400, while the sum is 58.

The square root of 79987855 is about 8943.5929580902. The cubic root of 79987855 is about 430.8651322285.

The spelling of 79987855 in words is "seventy-nine million, nine hundred eighty-seven thousand, eight hundred fifty-five".