99900864 has 140 divisors (see below), whose sum is σ = 338565744. Its totient is φ = 28532736.

The previous prime is 99900863. The next prime is 99900877. The reversal of 99900864 is 46800999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99900863) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34912 + ... + 37664.

Almost surely, 2^99900864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99900864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169282872).

99900864 is an abundant number, since it is smaller than the sum of its proper divisors (238664880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99900864 is a wasteful number, since it uses less digits than its factorization.

99900864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 99900864 is about 9995.0419708974. The cubic root of 99900864 is about 464.0054497973.

The spelling of 99900864 in words is "ninety-nine million, nine hundred thousand, eight hundred sixty-four".