99997988 has 24 divisors (see below), whose sum is σ = 185169600. Its totient is φ = 47119968.

The previous prime is 99997981. The next prime is 99998021. The reversal of 99997988 is 88979999.

It is not an unprimeable number, because it can be changed into a prime (99997981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11633 + ... + 18311.

It is an arithmetic number, because the mean of its divisors is an integer number (7715400).

Almost surely, 2^99997988 is an apocalyptic number.

It is an amenable number.

99997988 is a deficient number, since it is larger than the sum of its proper divisors (85171612).

99997988 is a wasteful number, since it uses less digits than its factorization.

99997988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6899 (or 6897 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 68.

The square root of 99997988 is about 9999.8993994940. The cubic root of 99997988 is about 464.1557703815.

The spelling of 99997988 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred eighty-eight".