99521028 has 24 divisors (see below), whose sum is σ = 258017760. Its totient is φ = 33173640.

The previous prime is 99521017. The next prime is 99521039. The reversal of 99521028 is 82012599.

It is an interprime number because it is at equal distance from previous prime (99521017) and next prime (99521039).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 99520983 and 99521001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460638 + ... + 460853.

It is an arithmetic number, because the mean of its divisors is an integer number (10750740).

Almost surely, 2^99521028 is an apocalyptic number.

It is an amenable number.

99521028 is an abundant number, since it is smaller than the sum of its proper divisors (158496732).

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

99521028 is a wasteful number, since it uses less digits than its factorization.

99521028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921504 (or 921496 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 99521028 is about 9976.0226543448. The cubic root of 99521028 is about 463.4166333447.

The spelling of 99521028 in words is "ninety-nine million, five hundred twenty-one thousand, twenty-eight".