99578840 has 64 divisors (see below), whose sum is σ = 234092160. Its totient is φ = 38085120.

The previous prime is 99578833. The next prime is 99578879. The reversal of 99578840 is 4887599.

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, 89729 + ... + 90831.

It is an arithmetic number, because the mean of its divisors is an integer number (3657690).

Almost surely, 2^99578840 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 99578840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117046080).

99578840 is an abundant number, since it is smaller than the sum of its proper divisors (134513320).

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

99578840 is a wasteful number, since it uses less digits than its factorization.

99578840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 99578840 is about 9978.9197812188. The cubic root of 99578840 is about 463.5063492468.

The spelling of 99578840 in words is "ninety-nine million, five hundred seventy-eight thousand, eight hundred forty".