99981604 has 12 divisors (see below), whose sum is σ = 175753984. Its totient is φ = 49766184.

The previous prime is 99981601. The next prime is 99981613. The reversal of 99981604 is 40618999.

It is a super-2 number, since 2×99981604² = 19992642276825632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99981601) 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, 55152 + ... + 56935.

Almost surely, 2^99981604 is an apocalyptic number.

It is an amenable number.

99981604 is a deficient number, since it is larger than the sum of its proper divisors (75772380).

99981604 is a wasteful number, since it uses less digits than its factorization.

99981604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112314 (or 112312 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 99981604 is about 9999.0801576945. The cubic root of 99981604 is about 464.1304193931.

The spelling of 99981604 in words is "ninety-nine million, nine hundred eighty-one thousand, six hundred four".