99722640 has 120 divisors (see below), whose sum is σ = 326550528. Its totient is φ = 25171200.

The previous prime is 99722639. The next prime is 99722647. The reversal of 99722640 is 4622799.

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

It is not an unprimeable number, because it can be changed into a prime (99722647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86065 + ... + 87215.

Almost surely, 2^99722640 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 99722640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163275264).

99722640 is an abundant number, since it is smaller than the sum of its proper divisors (226827888).

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

99722640 is a wasteful number, since it uses less digits than its factorization.

99722640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 99722640 is about 9986.1223705701. The cubic root of 99722640 is about 463.7293556439.

The spelling of 99722640 in words is "ninety-nine million, seven hundred twenty-two thousand, six hundred forty".