99921600 has 252 divisors, whose sum is σ = 369731544. Its totient is φ = 26542080.

The previous prime is 99921533. The next prime is 99921607. The reversal of 99921600 is 612999.

It is a super-2 number, since 2×99921600² = 19968652293120000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (99921607) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 388672 + ... + 388928.

Almost surely, 2^99921600 is an apocalyptic number.

99921600 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99921600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184865772).

99921600 is an abundant number, since it is smaller than the sum of its proper divisors (269809944).

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

99921600 is a wasteful number, since it uses less digits than its factorization.

99921600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 99921600 is about 9996.0792313787. The cubic root of 99921600 is about 464.0375514595.

The spelling of 99921600 in words is "ninety-nine million, nine hundred twenty-one thousand, six hundred".