99609872 has 20 divisors (see below), whose sum is σ = 201385920. Its totient is φ = 47639328.

The previous prime is 99609871. The next prime is 99609899. The reversal of 99609872 is 27890699.

It is a self number, because there is not a number n which added to its sum of digits gives 99609872.

It is not an unprimeable number, because it can be changed into a prime (99609871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134972 + ... + 135707.

It is an arithmetic number, because the mean of its divisors is an integer number (10069296).

Almost surely, 2^99609872 is an apocalyptic number.

99609872 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

99609872 is an abundant number, since it is smaller than the sum of its proper divisors (101776048).

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

99609872 is a wasteful number, since it uses less digits than its factorization.

99609872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270710 (or 270704 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 99609872 is about 9980.4745378163. The cubic root of 99609872 is about 463.5544921226.

The spelling of 99609872 in words is "ninety-nine million, six hundred nine thousand, eight hundred seventy-two".