99997688 has 64 divisors (see below), whose sum is σ = 222264000. Its totient is φ = 41287680.

The previous prime is 99997687. The next prime is 99997691. The reversal of 99997688 is 88679999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222488 + ... + 222936.

It is an arithmetic number, because the mean of its divisors is an integer number (3472875).

Almost surely, 2^99997688 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 99997688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111132000).

99997688 is an abundant number, since it is smaller than the sum of its proper divisors (122266312).

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

99997688 is a wasteful number, since it uses less digits than its factorization.

99997688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 596 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 65.

The square root of 99997688 is about 9999.8843993318. The cubic root of 99997688 is about 464.1553062159.

The spelling of 99997688 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred eighty-eight".