99709866 has 20 divisors (see below), whose sum is σ = 223424322. Its totient is φ = 33236568.

The previous prime is 99709847. The next prime is 99709873. The reversal of 99709866 is 66890799.

It can be written as a sum of positive squares in only one way, i.e., 57836025 + 41873841 = 7605^2 + 6471^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 307585 + ... + 307908.

Almost surely, 2^99709866 is an apocalyptic number.

99709866 is an abundant number, since it is smaller than the sum of its proper divisors (123714456).

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

99709866 is a wasteful number, since it uses less digits than its factorization.

99709866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615507 (or 615498 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 99709866 is about 9985.4827624908. The cubic root of 99709866 is about 463.7095542837.

The spelling of 99709866 in words is "ninety-nine million, seven hundred nine thousand, eight hundred sixty-six".