99215920 has 20 divisors (see below), whose sum is σ = 230677200. Its totient is φ = 39686336.

The previous prime is 99215911. The next prime is 99215933. The reversal of 99215920 is 2951299.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 99215920.

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, 620020 + ... + 620179.

It is an arithmetic number, because the mean of its divisors is an integer number (11533860).

Almost surely, 2^99215920 is an apocalyptic number.

It is an amenable number.

99215920 is an abundant number, since it is smaller than the sum of its proper divisors (131461280).

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

99215920 is a wasteful number, since it uses less digits than its factorization.

99215920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240212 (or 1240206 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 99215920 is about 9960.7188495610. The cubic root of 99215920 is about 462.9425731947.

The spelling of 99215920 in words is "ninety-nine million, two hundred fifteen thousand, nine hundred twenty".