99939968 has 64 divisors (see below), whose sum is σ = 210772800. Its totient is φ = 47106048.

The previous prime is 99939967. The next prime is 99940007. The reversal of 99939968 is 86993999.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 99939968.

It is not an unprimeable number, because it can be changed into a prime (99939967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244148 + ... + 244556.

It is an arithmetic number, because the mean of its divisors is an integer number (3293325).

Almost surely, 2^99939968 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 99939968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105386400).

99939968 is an abundant number, since it is smaller than the sum of its proper divisors (110832832).

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

99939968 is a wasteful number, since it uses less digits than its factorization.

99939968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 517 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 62.

The square root of 99939968 is about 9996.9979493846. The cubic root of 99939968 is about 464.0659834820.

The spelling of 99939968 in words is "ninety-nine million, nine hundred thirty-nine thousand, nine hundred sixty-eight".