9639872256 has 144 divisors (see below), whose sum is σ = 30114366464. Its totient is φ = 2679754752.

The previous prime is 9639872239. The next prime is 9639872267. The reversal of 9639872256 is 6522789369.

It is a super-2 number, since 2×9639872256² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9639872196 and 9639872205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174681 + ... + 223143.

Almost surely, 2^9639872256 is an apocalyptic number.

9639872256 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 9639872256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15057183232).

9639872256 is an abundant number, since it is smaller than the sum of its proper divisors (20474494208).

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

9639872256 is a wasteful number, since it uses less digits than its factorization.

9639872256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48526 (or 48512 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 57.

The square root of 9639872256 is about 98182.8511299198. The cubic root of 9639872256 is about 2128.2554765166.

The spelling of 9639872256 in words is "nine billion, six hundred thirty-nine million, eight hundred seventy-two thousand, two hundred fifty-six".