99972500 has 30 divisors (see below), whose sum is σ = 218625330. Its totient is φ = 39988000.

The previous prime is 99972487. The next prime is 99972503. The reversal of 99972500 is 527999.

It can be written as a sum of positive squares in 5 ways, for example, as 58033924 + 41938576 = 7618^2 + 6476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99972503) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17495 + ... + 22494.

It is an arithmetic number, because the mean of its divisors is an integer number (7287511).

Almost surely, 2^99972500 is an apocalyptic number.

It is an amenable number.

99972500 is an abundant number, since it is smaller than the sum of its proper divisors (118652830).

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

99972500 is a wasteful number, since it uses less digits than its factorization.

99972500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40013 (or 39996 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 99972500 is about 9998.6249054557. The cubic root of 99972500 is about 464.1163315628.

The spelling of 99972500 in words is "ninety-nine million, nine hundred seventy-two thousand, five hundred".