99561570 has 16 divisors (see below), whose sum is σ = 238947840. Its totient is φ = 26549744.

The previous prime is 99561569. The next prime is 99561589. The reversal of 99561570 is 7516599.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1659330 + ... + 1659389.

It is an arithmetic number, because the mean of its divisors is an integer number (14934240).

Almost surely, 2^99561570 is an apocalyptic number.

99561570 is an abundant number, since it is smaller than the sum of its proper divisors (139386270).

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

99561570 is a wasteful number, since it uses less digits than its factorization.

99561570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318729.

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 99561570 is about 9978.0544195750. The cubic root of 99561570 is about 463.4795523308.

The spelling of 99561570 in words is "ninety-nine million, five hundred sixty-one thousand, five hundred seventy".