99997866 has 24 divisors (see below), whose sum is σ = 217366500. Its totient is φ = 33224256.

The previous prime is 99997841. The next prime is 99997867. The reversal of 99997866 is 66879999.

It can be written as a sum of positive squares in 2 ways, for example, as 65950641 + 34047225 = 8121^2 + 5835^2 .

It is not an unprimeable number, because it can be changed into a prime (99997867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3241 + ... + 14508.

Almost surely, 2^99997866 is an apocalyptic number.

99997866 is an abundant number, since it is smaller than the sum of its proper divisors (117368634).

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

99997866 is a wasteful number, since it uses less digits than its factorization.

99997866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18070 (or 18067 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The square root of 99997866 is about 9999.8932994307. The cubic root of 99997866 is about 464.1555816209.

The spelling of 99997866 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred sixty-six".