99920225 has 24 divisors (see below), whose sum is σ = 128890560. Its totient is φ = 76749120.

The previous prime is 99920207. The next prime is 99920231. The reversal of 99920225 is 52202999.

It is a happy number.

It is not a de Polignac number, because 99920225 - 2⁸ = 99919969 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204932 + ... + 205418.

It is an arithmetic number, because the mean of its divisors is an integer number (5370440).

Almost surely, 2^99920225 is an apocalyptic number.

It is an amenable number.

99920225 is a deficient number, since it is larger than the sum of its proper divisors (28970335).

99920225 is a wasteful number, since it uses less digits than its factorization.

99920225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 99920225 is about 9996.0104541762. The cubic root of 99920225 is about 464.0354229422.

The spelling of 99920225 in words is "ninety-nine million, nine hundred twenty thousand, two hundred twenty-five".