99999880 has 16 divisors (see below), whose sum is σ = 224999820. Its totient is φ = 39999936.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999880 is 8899999.

It can be written as a sum of positive squares in 2 ways, for example, as 99082116 + 917764 = 9954^2 + 958^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1249959 + ... + 1250038.

Almost surely, 2^99999880 is an apocalyptic number.

It is an amenable number.

99999880 is an abundant number, since it is smaller than the sum of its proper divisors (124999940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999880 is a wasteful number, since it uses less digits than its factorization.

99999880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500008 (or 2500004 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 61.

The square root of 99999880 is about 9999.9939999982. The cubic root of 99999880 is about 464.1586976977.

The spelling of 99999880 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred eighty".