99997656 has 32 divisors (see below), whose sum is σ = 272721600. Its totient is φ = 30302240.

The previous prime is 99997649. The next prime is 99997669. The reversal of 99997656 is 65679999.

It is a self number, because there is not a number n which added to its sum of digits gives 99997656.

It is a congruent 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, 189126 + ... + 189653.

It is an arithmetic number, because the mean of its divisors is an integer number (8522550).

Almost surely, 2^99997656 is an apocalyptic number.

It is an amenable number.

99997656 is an abundant number, since it is smaller than the sum of its proper divisors (172723944).

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

99997656 is a wasteful number, since it uses less digits than its factorization.

99997656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378799 (or 378795 counting only the distinct ones).

The product of its digits is 8266860, while the sum is 60.

The square root of 99997656 is about 9999.8827993132. The cubic root of 99997656 is about 464.1552567049.

The spelling of 99997656 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred fifty-six".