87899979 has 16 divisors (see below), whose sum is σ = 124508448. Its totient is φ = 54968832.

The previous prime is 87899971. The next prime is 87899993. The reversal of 87899979 is 97999878.

It is not a de Polignac number, because 87899979 - 2³ = 87899971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87899971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13449 + ... + 18885.

It is an arithmetic number, because the mean of its divisors is an integer number (7781778).

Almost surely, 2^87899979 is an apocalyptic number.

87899979 is a deficient number, since it is larger than the sum of its proper divisors (36608469).

87899979 is a wasteful number, since it uses less digits than its factorization.

87899979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774.

The product of its digits is 20575296, while the sum is 66.

The square root of 87899979 is about 9375.4988667270. The cubic root of 87899979 is about 444.6274355056.

It can be divided in two parts, 8 and 7899979, that added together give a palindrome (7899987).

The spelling of 87899979 in words is "eighty-seven million, eight hundred ninety-nine thousand, nine hundred seventy-nine".