9900921600 has 540 divisors, whose sum is σ = 37261833840. Its totient is φ = 2593382400.

The previous prime is 9900921593. The next prime is 9900921631. The reversal of 9900921600 is 61290099.

It is a tau number, because it is divible by the number of its divisors (540).

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

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 36806266 + ... + 36806534.

It is an arithmetic number, because the mean of its divisors is an integer number (69003396).

Almost surely, 2^9900921600 is an apocalyptic number.

9900921600 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 9900921600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18630916920).

9900921600 is an abundant number, since it is smaller than the sum of its proper divisors (27360912240).

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

9900921600 is a wasteful number, since it uses less digits than its factorization.

9900921600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 350 counting only the distinct ones).

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

The square root of 9900921600 is about 99503.3748171387. The cubic root of 9900921600 is about 2147.2957961233.

The spelling of 9900921600 in words is "nine billion, nine hundred million, nine hundred twenty-one thousand, six hundred".