99939280 has 80 divisors (see below), whose sum is σ = 267304320. Its totient is φ = 34039296.

The previous prime is 99939271. The next prime is 99939283. The reversal of 99939280 is 8293999.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99939283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99742 + ... + 100738.

It is an arithmetic number, because the mean of its divisors is an integer number (3341304).

Almost surely, 2^99939280 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 99939280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133652160).

99939280 is an abundant number, since it is smaller than the sum of its proper divisors (167365040).

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

99939280 is a wasteful number, since it uses less digits than its factorization.

99939280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 99939280 is about 9996.9635389952. The cubic root of 99939280 is about 464.0649185822.

The spelling of 99939280 in words is "ninety-nine million, nine hundred thirty-nine thousand, two hundred eighty".