640043358744 has 64 divisors (see below), whose sum is σ = 1619636135040. Its totient is φ = 210744880640.

The previous prime is 640043358733. The next prime is 640043358767. The reversal of 640043358744 is 447853340046.

It is a super-3 number, since 3×640043358744³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640043358693 and 640043358702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15299584 + ... + 15341360.

It is an arithmetic number, because the mean of its divisors is an integer number (25306814610).

Almost surely, 2^640043358744 is an apocalyptic number.

It is an amenable number.

640043358744 is an abundant number, since it is smaller than the sum of its proper divisors (979592776296).

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

640043358744 is a wasteful number, since it uses less digits than its factorization.

640043358744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49560 (or 49556 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 640043358744 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred forty-four".