2644457656 has 16 divisors (see below), whose sum is σ = 4959750600. Its totient is φ = 1321857504.

The previous prime is 2644457653. The next prime is 2644457687. The reversal of 2644457656 is 6567544462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644457653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14890 + ... + 74233.

Almost surely, 2^2644457656 is an apocalyptic number.

It is an amenable number.

2644457656 is a deficient number, since it is larger than the sum of its proper divisors (2315292944).

2644457656 is a wasteful number, since it uses less digits than its factorization.

2644457656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92838 (or 92834 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 49.

The square root of 2644457656 is about 51424.2905250038. The cubic root of 2644457656 is about 1382.8620946910.

It can be divided in two parts, 26444 and 57656, that added together give a square (84100 = 290²).

The spelling of 2644457656 in words is "two billion, six hundred forty-four million, four hundred fifty-seven thousand, six hundred fifty-six".