6440264680 has 32 divisors (see below), whose sum is σ = 14507942400. Its totient is φ = 2573022016.

The previous prime is 6440264641. The next prime is 6440264689. The reversal of 6440264680 is 864620446.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (6440264689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62392 + ... + 129511.

It is an arithmetic number, because the mean of its divisors is an integer number (453373200).

Almost surely, 2^6440264680 is an apocalyptic number.

It is an amenable number.

6440264680 is an abundant number, since it is smaller than the sum of its proper divisors (8067677720).

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

6440264680 is a wasteful number, since it uses less digits than its factorization.

6440264680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192753 (or 192749 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 6440264680 is about 80251.2596785870. The cubic root of 6440264680 is about 1860.5209817439.

The spelling of 6440264680 in words is "six billion, four hundred forty million, two hundred sixty-four thousand, six hundred eighty".