99139178880 has 768 divisors, whose sum is σ = 427179916800. Its totient is φ = 21463252992.

The previous prime is 99139178869. The next prime is 99139178903. The reversal of 99139178880 is 8887193199.

99139178880 is a `hidden beast` number, since 9 + 91 + 391 + 7 + 88 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20681764 + ... + 20686556.

It is an arithmetic number, because the mean of its divisors is an integer number (556223850).

Almost surely, 2^99139178880 is an apocalyptic number.

99139178880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99139178880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213589958400).

99139178880 is an abundant number, since it is smaller than the sum of its proper divisors (328040737920).

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

99139178880 is a wasteful number, since it uses less digits than its factorization.

99139178880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4853 (or 4829 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 63.

The spelling of 99139178880 in words is "ninety-nine billion, one hundred thirty-nine million, one hundred seventy-eight thousand, eight hundred eighty".