99565820 has 12 divisors (see below), whose sum is σ = 209088264. Its totient is φ = 39826320.

The previous prime is 99565811. The next prime is 99565859. The reversal of 99565820 is 2856599.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2489126 + ... + 2489165.

It is an arithmetic number, because the mean of its divisors is an integer number (17424022).

Almost surely, 2^99565820 is an apocalyptic number.

It is an amenable number.

99565820 is an abundant number, since it is smaller than the sum of its proper divisors (109522444).

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

99565820 is a wasteful number, since it uses less digits than its factorization.

99565820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978300 (or 4978298 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 99565820 is about 9978.2673846715. The cubic root of 99565820 is about 463.4861471112.

The spelling of 99565820 in words is "ninety-nine million, five hundred sixty-five thousand, eight hundred twenty".