99865020 has 24 divisors (see below), whose sum is σ = 279622224. Its totient is φ = 26630656.

The previous prime is 99865001. The next prime is 99865033. The reversal of 99865020 is 2056899.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 99865020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832149 + ... + 832268.

It is an arithmetic number, because the mean of its divisors is an integer number (11650926).

Almost surely, 2^99865020 is an apocalyptic number.

It is an amenable number.

99865020 is an abundant number, since it is smaller than the sum of its proper divisors (179757204).

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

99865020 is a wasteful number, since it uses less digits than its factorization.

99865020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664429 (or 1664427 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 99865020 is about 9993.2487210116. The cubic root of 99865020 is about 463.9499487728.

The spelling of 99865020 in words is "ninety-nine million, eight hundred sixty-five thousand, twenty".