99640868 has 24 divisors (see below), whose sum is σ = 180780600. Its totient is φ = 47996928.

The previous prime is 99640831. The next prime is 99640873. The reversal of 99640868 is 86804699.

It can be written as a sum of positive squares in 4 ways, for example, as 399424 + 99241444 = 632^2 + 9962^2 .

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, 88646 + ... + 89762.

It is an arithmetic number, because the mean of its divisors is an integer number (7532525).

Almost surely, 2^99640868 is an apocalyptic number.

It is an amenable number.

99640868 is a deficient number, since it is larger than the sum of its proper divisors (81139732).

99640868 is a wasteful number, since it uses less digits than its factorization.

99640868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1917 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 99640868 is about 9982.0272490111. The cubic root of 99640868 is about 463.6025691677.

The spelling of 99640868 in words is "ninety-nine million, six hundred forty thousand, eight hundred sixty-eight".