6439651464 has 64 divisors (see below), whose sum is σ = 16290892800. Its totient is φ = 2121074496.

The previous prime is 6439651457. The next prime is 6439651469. The reversal of 6439651464 is 4641569346.

It is a super-2 number, since 2×6439651464² = 82938221955594686592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6439651469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1240827 + ... + 1246005.

It is an arithmetic number, because the mean of its divisors is an integer number (254545200).

Almost surely, 2^6439651464 is an apocalyptic number.

It is an amenable number.

6439651464 is an abundant number, since it is smaller than the sum of its proper divisors (9851241336).

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

6439651464 is a wasteful number, since it uses less digits than its factorization.

6439651464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5794 (or 5790 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 48.

The square root of 6439651464 is about 80247.4389871727. The cubic root of 6439651464 is about 1860.4619294377.

The spelling of 6439651464 in words is "six billion, four hundred thirty-nine million, six hundred fifty-one thousand, four hundred sixty-four".