99028521 has 8 divisors (see below), whose sum is σ = 146708960. Its totient is φ = 66018996.

The previous prime is 99028499. The next prime is 99028537. The reversal of 99028521 is 12582099.

It is a de Polignac number, because none of the positive numbers 2^k-99028521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99028421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1833835 + ... + 1833888.

It is an arithmetic number, because the mean of its divisors is an integer number (18338620).

Almost surely, 2^99028521 is an apocalyptic number.

It is an amenable number.

99028521 is a deficient number, since it is larger than the sum of its proper divisors (47680439).

99028521 is a wasteful number, since it uses less digits than its factorization.

99028521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667732 (or 3667726 counting only the distinct ones).

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

The square root of 99028521 is about 9951.3075020321. The cubic root of 99028521 is about 462.6509208954.

The spelling of 99028521 in words is "ninety-nine million, twenty-eight thousand, five hundred twenty-one".