99621920 has 24 divisors (see below), whose sum is σ = 235357164. Its totient is φ = 39848704.

The previous prime is 99621917. The next prime is 99621937. The reversal of 99621920 is 2912699.

It can be written as a sum of positive squares in 2 ways, for example, as 93006736 + 6615184 = 9644^2 + 2572^2 .

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, 311159 + ... + 311478.

Almost surely, 2^99621920 is an apocalyptic number.

It is an amenable number.

99621920 is an abundant number, since it is smaller than the sum of its proper divisors (135735244).

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

99621920 is a wasteful number, since it uses less digits than its factorization.

99621920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622652 (or 622644 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 99621920 is about 9981.0780980814. The cubic root of 99621920 is about 463.5731806296.

The spelling of 99621920 in words is "ninety-nine million, six hundred twenty-one thousand, nine hundred twenty".