99129978 has 24 divisors (see below), whose sum is σ = 215728500. Its totient is φ = 32897664.

The previous prime is 99129929. The next prime is 99129983. The reversal of 99129978 is 87992199.

It can be written as a sum of positive squares in 2 ways, for example, as 92794689 + 6335289 = 9633^2 + 2517^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7903 + ... + 16146.

Almost surely, 2^99129978 is an apocalyptic number.

99129978 is an abundant number, since it is smaller than the sum of its proper divisors (116598522).

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

99129978 is a wasteful number, since it uses less digits than its factorization.

99129978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24286 (or 24283 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 99129978 is about 9956.4038688675. The cubic root of 99129978 is about 462.8088658087.

The spelling of 99129978 in words is "ninety-nine million, one hundred twenty-nine thousand, nine hundred seventy-eight".