6397440256 has 27 divisors (see below), whose sum is σ = 12772445511. Its totient is φ = 3198080256.

The previous prime is 6397440251. The next prime is 6397440299. The reversal of 6397440256 is 6520447936.

The square root of 6397440256 is 79984.

It is a perfect power (a square), and thus also a powerful number.

It is a super-3 number, since 3×6397440256³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6397440251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1277245 + ... + 1282243.

Almost surely, 2^6397440256 is an apocalyptic number.

6397440256 is the 79984-th square number.

It is an amenable number.

6397440256 is a deficient number, since it is larger than the sum of its proper divisors (6375005255).

6397440256 is an frugal number, since it uses more digits than its factorization.

6397440256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10014 (or 5001 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The cubic root of 6397440256 is about 1856.3879737882.

The spelling of 6397440256 in words is "six billion, three hundred ninety-seven million, four hundred forty thousand, two hundred fifty-six".