99639512 has 32 divisors (see below), whose sum is σ = 218725920. Its totient is φ = 41660160.

The previous prime is 99639497. The next prime is 99639539. The reversal of 99639512 is 21593699.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19403 + ... + 23994.

It is an arithmetic number, because the mean of its divisors is an integer number (6835185).

Almost surely, 2^99639512 is an apocalyptic number.

It is an amenable number.

99639512 is an abundant number, since it is smaller than the sum of its proper divisors (119086408).

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

99639512 is a wasteful number, since it uses less digits than its factorization.

99639512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43451 (or 43447 counting only the distinct ones).

The product of its digits is 131220, while the sum is 44.

The square root of 99639512 is about 9981.9593267054. The cubic root of 99639512 is about 463.6004661219.

The spelling of 99639512 in words is "ninety-nine million, six hundred thirty-nine thousand, five hundred twelve".