9901787904 has 216 divisors, whose sum is σ = 30540156192. Its totient is φ = 3074457600.

The previous prime is 9901787899. The next prime is 9901787957. The reversal of 9901787904 is 4097871099.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3954717 + ... + 3957219.

It is an arithmetic number, because the mean of its divisors is an integer number (141389612).

Almost surely, 2^9901787904 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 9901787904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15270078096).

9901787904 is an abundant number, since it is smaller than the sum of its proper divisors (20638368288).

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

9901787904 is a wasteful number, since it uses less digits than its factorization.

9901787904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643 (or 2626 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 9901787904 is about 99507.7278607044. The cubic root of 9901787904 is about 2147.3584218317.

The spelling of 9901787904 in words is "nine billion, nine hundred one million, seven hundred eighty-seven thousand, nine hundred four".