99157988 has 6 divisors (see below), whose sum is σ = 173526486. Its totient is φ = 49578992.

The previous prime is 99157987. The next prime is 99157999. The reversal of 99157988 is 88975199.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 75030244 + 24127744 = 8662^2 + 4912^2 .

It is not an unprimeable number, because it can be changed into a prime (99157987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12394745 + ... + 12394752.

It is an arithmetic number, because the mean of its divisors is an integer number (28921081).

Almost surely, 2^99157988 is an apocalyptic number.

It is an amenable number.

99157988 is a deficient number, since it is larger than the sum of its proper divisors (74368498).

99157988 is a wasteful number, since it uses less digits than its factorization.

99157988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24789501 (or 24789499 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 56.

The square root of 99157988 is about 9957.8104018906. The cubic root of 99157988 is about 462.8524518689.

The spelling of 99157988 in words is "ninety-nine million, one hundred fifty-seven thousand, nine hundred eighty-eight".