99520 has 28 divisors (see below), whose sum is σ = 237744. Its totient is φ = 39680.

The previous prime is 99497. The next prime is 99523. The reversal of 99520 is 2599.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99523) by changing a digit.

99520 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165 + ... + 475.

2⁹⁹⁵²⁰ 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 99520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118872).

99520 is an abundant number, since it is smaller than the sum of its proper divisors (138224).

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

99520 is a wasteful number, since it uses less digits than its factorization.

99520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 99520 is about 315.4679064501. The cubic root of 99520 is about 46.3415037722.

It can be divided in two parts, 995 and 20, that multiplied together give a triangular number (19900 = T₁₉₉).

The spelling of 99520 in words is "ninety-nine thousand, five hundred twenty".