99815120 has 30 divisors (see below), whose sum is σ = 232278102. Its totient is φ = 39890304.

The previous prime is 99815119. The next prime is 99815123. The reversal of 99815120 is 2151899.

It can be written as a sum of positive squares in 3 ways, for example, as 6190144 + 93624976 = 2488^2 + 9676^2 .

It is a super-2 number, since 2×99815120² = 19926116361228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99815123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88802 + ... + 89918.

Almost surely, 2^99815120 is an apocalyptic number.

It is an amenable number.

99815120 is an abundant number, since it is smaller than the sum of its proper divisors (132462982).

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

99815120 is an equidigital number, since it uses as much as digits as its factorization.

99815120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 99815120 is about 9990.7517234691. The cubic root of 99815120 is about 463.8726612517.

Multiplying 99815120 by its product of nonzero digits (6480), we get a square (646801977600 = 804240²).

The spelling of 99815120 in words is "ninety-nine million, eight hundred fifteen thousand, one hundred twenty".