99939688 has 8 divisors (see below), whose sum is σ = 187386930. Its totient is φ = 49969840.

The previous prime is 99939683. The next prime is 99939703. The reversal of 99939688 is 88693999.

It can be written as a sum of positive squares in only one way, i.e., 99161764 + 777924 = 9958^2 + 882^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (99939683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6246223 + ... + 6246238.

Almost surely, 2^99939688 is an apocalyptic number.

It is an amenable number.

99939688 is a deficient number, since it is larger than the sum of its proper divisors (87447242).

99939688 is a wasteful number, since it uses less digits than its factorization.

99939688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12492467 (or 12492463 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 61.

The square root of 99939688 is about 9996.9839451707. The cubic root of 99939688 is about 464.0655500931.

The spelling of 99939688 in words is "ninety-nine million, nine hundred thirty-nine thousand, six hundred eighty-eight".