99988887 has 16 divisors (see below), whose sum is σ = 140837760. Its totient is φ = 62924832.

The previous prime is 99988879. The next prime is 99988913. The reversal of 99988887 is 78888999.

It is not a de Polignac number, because 99988887 - 2³ = 99988879 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99988807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13708 + ... + 19694.

It is an arithmetic number, because the mean of its divisors is an integer number (8802360).

Almost surely, 2^99988887 is an apocalyptic number.

99988887 is a deficient number, since it is larger than the sum of its proper divisors (40848873).

99988887 is a wasteful number, since it uses less digits than its factorization.

99988887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6302.

The product of its digits is 20901888, while the sum is 66.

The square root of 99988887 is about 9999.4443345618. Note that the first 3 decimals coincide. The cubic root of 99988887 is about 464.1416887321.

The spelling of 99988887 in words is "ninety-nine million, nine hundred eighty-eight thousand, eight hundred eighty-seven".