640075985600 has 84 divisors (see below), whose sum is σ = 1580020115544. Its totient is φ = 255212206080.

The previous prime is 640075985587. The next prime is 640075985669. The reversal of 640075985600 is 6589570046.

It is a super-2 number, since 2×640075985600² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138254 + ... + 1139853.

Almost surely, 2^640075985600 is an apocalyptic number.

It is an amenable number.

640075985600 is an abundant number, since it is smaller than the sum of its proper divisors (939944129944).

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

640075985600 is a wasteful number, since it uses less digits than its factorization.

640075985600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278442 (or 1278427 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 640075985600 in words is "six hundred forty billion, seventy-five million, nine hundred eighty-five thousand, six hundred".