3257646464 has 16 divisors (see below), whose sum is σ = 6489842820. Its totient is φ = 1628823168.

The previous prime is 3257646461. The next prime is 3257646479. The reversal of 3257646464 is 4646467523.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×3257646464² = 21224520968823406592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3257646461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12725054 + ... + 12725309.

Almost surely, 2^3257646464 is an apocalyptic number.

It is an amenable number.

3257646464 is a deficient number, since it is larger than the sum of its proper divisors (3232196356).

3257646464 is an equidigital number, since it uses as much as digits as its factorization.

3257646464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25450377 (or 25450365 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 47.

The square root of 3257646464 is about 57075.7957806985. The cubic root of 3257646464 is about 1482.4087971444.

The spelling of 3257646464 in words is "three billion, two hundred fifty-seven million, six hundred forty-six thousand, four hundred sixty-four".