99917520 has 120 divisors (see below), whose sum is σ = 324208416. Its totient is φ = 25453824.

The previous prime is 99917479. The next prime is 99917539. The reversal of 99917520 is 2571999.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126567 + ... + 127353.

Almost surely, 2^99917520 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 99917520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162104208).

99917520 is an abundant number, since it is smaller than the sum of its proper divisors (224290896).

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

99917520 is a wasteful number, since it uses less digits than its factorization.

99917520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 99917520 is about 9995.8751492803. The cubic root of 99917520 is about 464.0312355112.

The spelling of 99917520 in words is "ninety-nine million, nine hundred seventeen thousand, five hundred twenty".