640432075744 has 24 divisors (see below), whose sum is σ = 1276810788960. Its totient is φ = 316162669056.

The previous prime is 640432075721. The next prime is 640432075841. The reversal of 640432075744 is 447570234046.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 640432075694 and 640432075703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126665209 + ... + 126670264.

It is an arithmetic number, because the mean of its divisors is an integer number (53200449540).

Almost surely, 2^640432075744 is an apocalyptic number.

It is an amenable number.

640432075744 is a deficient number, since it is larger than the sum of its proper divisors (636378713216).

640432075744 is a wasteful number, since it uses less digits than its factorization.

640432075744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253335562 (or 253335554 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 46.

The spelling of 640432075744 in words is "six hundred forty billion, four hundred thirty-two million, seventy-five thousand, seven hundred forty-four".