99397025280 has 720 divisors, whose sum is σ = 424079575920. Its totient is φ = 21378760704.

The previous prime is 99397025279. The next prime is 99397025317. The reversal of 99397025280 is 8252079399.

It is a tau number, because it is divible by the number of its divisors (720).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19189731 + ... + 19194909.

It is an arithmetic number, because the mean of its divisors is an integer number (588999411).

Almost surely, 2^99397025280 is an apocalyptic number.

99397025280 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 99397025280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212039787960).

99397025280 is an abundant number, since it is smaller than the sum of its proper divisors (324682550640).

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

99397025280 is a wasteful number, since it uses less digits than its factorization.

99397025280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239 (or 5213 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 99397025280 in words is "ninety-nine billion, three hundred ninety-seven million, twenty-five thousand, two hundred eighty".