640544883 has 16 divisors (see below), whose sum is σ = 932180736. Its totient is φ = 388009440.

The previous prime is 640544867. The next prime is 640544893. The reversal of 640544883 is 388445046.

It is not a de Polignac number, because 640544883 - 2⁴ = 640544867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640544893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83685 + ... + 91017.

It is an arithmetic number, because the mean of its divisors is an integer number (58261296).

Almost surely, 2^640544883 is an apocalyptic number.

640544883 is a deficient number, since it is larger than the sum of its proper divisors (291635853).

640544883 is a wasteful number, since it uses less digits than its factorization.

640544883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9994.

The product of its (nonzero) digits is 368640, while the sum is 42.

The square root of 640544883 is about 25308.9881860180. The cubic root of 640544883 is about 862.0183722306.

The spelling of 640544883 in words is "six hundred forty million, five hundred forty-four thousand, eight hundred eighty-three".