99664388 has 12 divisors (see below), whose sum is σ = 174797532. Its totient is φ = 49722240.

The previous prime is 99664381. The next prime is 99664391. The reversal of 99664388 is 88346699.

It can be written as a sum of positive squares in 2 ways, for example, as 64995844 + 34668544 = 8062^2 + 5888^2 .

It is not an unprimeable number, because it can be changed into a prime (99664381) 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, 25433 + ... + 29088.

It is an arithmetic number, because the mean of its divisors is an integer number (14566461).

Almost surely, 2^99664388 is an apocalyptic number.

It is an amenable number.

99664388 is a deficient number, since it is larger than the sum of its proper divisors (75133144).

99664388 is a wasteful number, since it uses less digits than its factorization.

99664388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54982 (or 54980 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The square root of 99664388 is about 9983.2052968974. The cubic root of 99664388 is about 463.6390437416.

The spelling of 99664388 in words is "ninety-nine million, six hundred sixty-four thousand, three hundred eighty-eight".