99431280 has 160 divisors (see below), whose sum is σ = 368934720. Its totient is φ = 24468480.

The previous prime is 99431263. The next prime is 99431309. The reversal of 99431280 is 8213499.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26310 + ... + 29850.

It is an arithmetic number, because the mean of its divisors is an integer number (2305842).

Almost surely, 2^99431280 is an apocalyptic number.

99431280 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 99431280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184467360).

99431280 is an abundant number, since it is smaller than the sum of its proper divisors (269503440).

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

99431280 is a wasteful number, since it uses less digits than its factorization.

99431280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 99431280 is about 9971.5234543173. The cubic root of 99431280 is about 463.2772885072.

The spelling of 99431280 in words is "ninety-nine million, four hundred thirty-one thousand, two hundred eighty".