99639265 has 24 divisors (see below), whose sum is σ = 132388200. Its totient is φ = 71934720.

The previous prime is 99639257. The next prime is 99639269. The reversal of 99639265 is 56293699.

It can be written as a sum of positive squares in 4 ways, for example, as 19070689 + 80568576 = 4367^2 + 8976^2 .

It is not a de Polignac number, because 99639265 - 2³ = 99639257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99639269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94461 + ... + 95509.

It is an arithmetic number, because the mean of its divisors is an integer number (5516175).

Almost surely, 2^99639265 is an apocalyptic number.

It is an amenable number.

99639265 is a deficient number, since it is larger than the sum of its proper divisors (32748935).

99639265 is a wasteful number, since it uses less digits than its factorization.

99639265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233 (or 1222 counting only the distinct ones).

The product of its digits is 787320, while the sum is 49.

The square root of 99639265 is about 9981.9469543772. The cubic root of 99639265 is about 463.6000830429.

The spelling of 99639265 in words is "ninety-nine million, six hundred thirty-nine thousand, two hundred sixty-five".