99564638 has 8 divisors (see below), whose sum is σ = 150263688. Its totient is φ = 49476744.

The previous prime is 99564637. The next prime is 99564721. The reversal of 99564638 is 83646599.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99564637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152381 + ... + 153032.

It is an arithmetic number, because the mean of its divisors is an integer number (18782961).

Almost surely, 2^99564638 is an apocalyptic number.

99564638 is a deficient number, since it is larger than the sum of its proper divisors (50699050).

99564638 is a wasteful number, since it uses less digits than its factorization.

99564638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305578.

The product of its digits is 1399680, while the sum is 50.

The square root of 99564638 is about 9978.2081557763. The cubic root of 99564638 is about 463.4843130052.

The spelling of 99564638 in words is "ninety-nine million, five hundred sixty-four thousand, six hundred thirty-eight".