99668638 has 16 divisors (see below), whose sum is σ = 150793776. Its totient is φ = 49406400.

The previous prime is 99668629. The next prime is 99668669. The reversal of 99668638 is 83686699.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165538 + ... + 166138.

It is an arithmetic number, because the mean of its divisors is an integer number (9424611).

Almost surely, 2^99668638 is an apocalyptic number.

99668638 is a deficient number, since it is larger than the sum of its proper divisors (51125138).

99668638 is a wasteful number, since it uses less digits than its factorization.

99668638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179.

The product of its digits is 3359232, while the sum is 55.

The square root of 99668638 is about 9983.4181521160. The cubic root of 99668638 is about 463.6456339856.

The spelling of 99668638 in words is "ninety-nine million, six hundred sixty-eight thousand, six hundred thirty-eight".