99907788 has 12 divisors (see below), whose sum is σ = 233118200. Its totient is φ = 33302592.

The previous prime is 99907781. The next prime is 99907849. The reversal of 99907788 is 88770999.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×99907788² = 19963132206105888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99907781) 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, 4162813 + ... + 4162836.

Almost surely, 2^99907788 is an apocalyptic number.

It is an amenable number.

99907788 is an abundant number, since it is smaller than the sum of its proper divisors (133210412).

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

99907788 is a wasteful number, since it uses less digits than its factorization.

99907788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8325656 (or 8325654 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 99907788 is about 9995.3883366280. The cubic root of 99907788 is about 464.0161694227.

The spelling of 99907788 in words is "ninety-nine million, nine hundred seven thousand, seven hundred eighty-eight".