99551280 has 160 divisors (see below), whose sum is σ = 322979328. Its totient is φ = 25344000.

The previous prime is 99551273. The next prime is 99551281. The reversal of 99551280 is 8215599.

It is not an unprimeable number, because it can be changed into a prime (99551281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 659205 + ... + 659355.

Almost surely, 2^99551280 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 99551280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161489664).

99551280 is an abundant number, since it is smaller than the sum of its proper divisors (223428048).

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

99551280 is a wasteful number, since it uses less digits than its factorization.

99551280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 99551280 is about 9977.5387746678. The cubic root of 99551280 is about 463.4635844263.

The spelling of 99551280 in words is "ninety-nine million, five hundred fifty-one thousand, two hundred eighty".