99817988 has 12 divisors (see below), whose sum is σ = 175145040. Its totient is φ = 49776552.

The previous prime is 99817987. The next prime is 99818009. The reversal of 99817988 is 88971899.

It is not an unprimeable number, because it can be changed into a prime (99817987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31406 + ... + 34437.

It is an arithmetic number, because the mean of its divisors is an integer number (14595420).

Almost surely, 2^99817988 is an apocalyptic number.

It is an amenable number.

99817988 is a deficient number, since it is larger than the sum of its proper divisors (75327052).

99817988 is a wasteful number, since it uses less digits than its factorization.

99817988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66226 (or 66224 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 59.

The square root of 99817988 is about 9990.8952551811. The cubic root of 99817988 is about 463.8771040458.

The spelling of 99817988 in words is "ninety-nine million, eight hundred seventeen thousand, nine hundred eighty-eight".