5631256644 has 24 divisors (see below), whose sum is σ = 14150337600. Its totient is φ = 1732694304.

The previous prime is 5631256607. The next prime is 5631256679. The reversal of 5631256644 is 4466521365.

It is a super-2 number, since 2×5631256644² = 63422102781188285472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5631256596 and 5631256605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18048744 + ... + 18049055.

It is an arithmetic number, because the mean of its divisors is an integer number (589597400).

Almost surely, 2^5631256644 is an apocalyptic number.

It is an amenable number.

5631256644 is an abundant number, since it is smaller than the sum of its proper divisors (8519080956).

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

5631256644 is a wasteful number, since it uses less digits than its factorization.

5631256644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36097819 (or 36097817 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 5631256644 is about 75041.6993677515. The cubic root of 5631256644 is about 1779.1057920727.

The spelling of 5631256644 in words is "five billion, six hundred thirty-one million, two hundred fifty-six thousand, six hundred forty-four".