6400972744 has 8 divisors (see below), whose sum is σ = 12001823910. Its totient is φ = 3200486368.

The previous prime is 6400972727. The next prime is 6400972793. The reversal of 6400972744 is 4472790046.

It can be written as a sum of positive squares in only one way, i.e., 3437476900 + 2963495844 = 58630^2 + 54438^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6400972744.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400060789 + ... + 400060804.

Almost surely, 2^6400972744 is an apocalyptic number.

It is an amenable number.

6400972744 is a deficient number, since it is larger than the sum of its proper divisors (5600851166).

6400972744 is a wasteful number, since it uses less digits than its factorization.

6400972744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800121599 (or 800121595 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 6400972744 is about 80006.0794190042. The cubic root of 6400972744 is about 1856.7295927984.

The spelling of 6400972744 in words is "six billion, four hundred million, nine hundred seventy-two thousand, seven hundred forty-four".