9721880256 has 112 divisors (see below), whose sum is σ = 28101340800. Its totient is φ = 2941777920.

The previous prime is 9721880251. The next prime is 9721880291. The reversal of 9721880256 is 6520881279.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (9721880251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1659220 + ... + 1665068.

Almost surely, 2^9721880256 is an apocalyptic number.

9721880256 is a gapful number since it is divisible by the number (96) 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 9721880256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14050670400).

9721880256 is an abundant number, since it is smaller than the sum of its proper divisors (18379460544).

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

9721880256 is a wasteful number, since it uses less digits than its factorization.

9721880256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662 (or 6652 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 9721880256 is about 98599.5956178320. The cubic root of 9721880256 is about 2134.2735843151.

The spelling of 9721880256 in words is "nine billion, seven hundred twenty-one million, eight hundred eighty thousand, two hundred fifty-six".