87987879 has 36 divisors (see below), whose sum is σ = 155639640. Its totient is φ = 47628000.

The previous prime is 87987877. The next prime is 87987899. The reversal of 87987879 is 97878978.

It is not a de Polignac number, because 87987879 - 2¹ = 87987877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87987877) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3129 + ... + 13629.

Almost surely, 2^87987879 is an apocalyptic number.

87987879 is a deficient number, since it is larger than the sum of its proper divisors (67651761).

87987879 is a wasteful number, since it uses less digits than its factorization.

87987879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10540 (or 10530 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 63.

The square root of 87987879 is about 9380.1854459280. The cubic root of 87987879 is about 444.7755953105.

The spelling of 87987879 in words is "eighty-seven million, nine hundred eighty-seven thousand, eight hundred seventy-nine".