99865040 has 80 divisors (see below), whose sum is σ = 254822976. Its totient is φ = 36096000.

The previous prime is 99865039. The next prime is 99865061. The reversal of 99865040 is 4056899.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248840 + ... + 249240.

Almost surely, 2^99865040 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 99865040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127411488).

99865040 is an abundant number, since it is smaller than the sum of its proper divisors (154957936).

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

99865040 is a wasteful number, since it uses less digits than its factorization.

99865040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 702 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 99865040 is about 9993.2497216871. The cubic root of 99865040 is about 463.9499797446.

The spelling of 99865040 in words is "ninety-nine million, eight hundred sixty-five thousand, forty".