99240720 has 80 divisors (see below), whose sum is σ = 309355200. Its totient is φ = 26317312.

The previous prime is 99240677. The next prime is 99240727. The reversal of 99240720 is 2704299.

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

It is a super-2 number, since 2×99240720² = 19697441012236800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99240727) 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, 46231 + ... + 48329.

It is an arithmetic number, because the mean of its divisors is an integer number (3866940).

Almost surely, 2^99240720 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 99240720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154677600).

99240720 is an abundant number, since it is smaller than the sum of its proper divisors (210114480).

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

99240720 is a wasteful number, since it uses less digits than its factorization.

99240720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312 (or 2306 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 99240720 is about 9961.9636618490. The cubic root of 99240720 is about 462.9811423388.

The spelling of 99240720 in words is "ninety-nine million, two hundred forty thousand, seven hundred twenty".