99997664 has 24 divisors (see below), whose sum is σ = 212015160. Its totient is φ = 46152576.

The previous prime is 99997649. The next prime is 99997669. The reversal of 99997664 is 46679999.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119774 + ... + 120605.

It is an arithmetic number, because the mean of its divisors is an integer number (8833965).

Almost surely, 2^99997664 is an apocalyptic number.

It is an amenable number.

99997664 is an abundant number, since it is smaller than the sum of its proper divisors (112017496).

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

99997664 is a wasteful number, since it uses less digits than its factorization.

99997664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240402 (or 240394 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 59.

The square root of 99997664 is about 9999.8831993179. The cubic root of 99997664 is about 464.1552690826.

The spelling of 99997664 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred sixty-four".