99808920 has 48 divisors (see below), whose sum is σ = 324380160. Its totient is φ = 26615616.

The previous prime is 99808913. The next prime is 99808931. The reversal of 99808920 is 2980899.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138264 + ... + 138983.

It is an arithmetic number, because the mean of its divisors is an integer number (6757920).

Almost surely, 2^99808920 is an apocalyptic number.

99808920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99808920 is an abundant number, since it is smaller than the sum of its proper divisors (224571240).

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

99808920 is a wasteful number, since it uses less digits than its factorization.

99808920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277264 (or 277257 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 99808920 is about 9990.4414316886. The cubic root of 99808920 is about 463.8630565945.

The spelling of 99808920 in words is "ninety-nine million, eight hundred eight thousand, nine hundred twenty".