99972288 has 168 divisors, whose sum is σ = 314350400. Its totient is φ = 30371328.

The previous prime is 99972287. The next prime is 99972289. The reversal of 99972288 is 88227999.

It is an interprime number because it is at equal distance from previous prime (99972287) and next prime (99972289).

It is not an unprimeable number, because it can be changed into a prime (99972287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1265433 + ... + 1265511.

Almost surely, 2^99972288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99972288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157175200).

99972288 is an abundant number, since it is smaller than the sum of its proper divisors (214378112).

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

99972288 is a wasteful number, since it uses less digits than its factorization.

99972288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 97 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 99972288 is about 9998.6143039923. The cubic root of 99972288 is about 464.1160034968.

The spelling of 99972288 in words is "ninety-nine million, nine hundred seventy-two thousand, two hundred eighty-eight".