99309815280 has 240 divisors, whose sum is σ = 380298784320. Its totient is φ = 23007485952.

The previous prime is 99309815279. The next prime is 99309815287. The reversal of 99309815280 is 8251890399.

99309815280 is a `hidden beast` number, since 9 + 9 + 30 + 9 + 81 + 528 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99309815287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152940 + ... + 471179.

It is an arithmetic number, because the mean of its divisors is an integer number (1584578268).

Almost surely, 2^99309815280 is an apocalyptic number.

99309815280 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99309815280 is an abundant number, since it is smaller than the sum of its proper divisors (280988969040).

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

99309815280 is a wasteful number, since it uses less digits than its factorization.

99309815280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624168 (or 624159 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 99309815280 in words is "ninety-nine billion, three hundred nine million, eight hundred fifteen thousand, two hundred eighty".