640202689528 has 16 divisors (see below), whose sum is σ = 1214842454280. Its totient is φ = 316244701728.

The previous prime is 640202689471. The next prime is 640202689547. The reversal of 640202689528 is 825986202046.

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, 482079675 + ... + 482081002.

Almost surely, 2^640202689528 is an apocalyptic number.

It is an amenable number.

640202689528 is a deficient number, since it is larger than the sum of its proper divisors (574639764752).

640202689528 is a wasteful number, since it uses less digits than its factorization.

640202689528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964160766 (or 964160762 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 640202689528 in words is "six hundred forty billion, two hundred two million, six hundred eighty-nine thousand, five hundred twenty-eight".