640028824 has 16 divisors (see below), whose sum is σ = 1201304520. Its totient is φ = 319680960.

The previous prime is 640028803. The next prime is 640028827. The reversal of 640028824 is 428820046.

It is a self number, because there is not a number n which added to its sum of digits gives 640028824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640028827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33429 + ... + 48964.

Almost surely, 2^640028824 is an apocalyptic number.

It is an amenable number.

640028824 is a deficient number, since it is larger than the sum of its proper divisors (561275696).

640028824 is a wasteful number, since it uses less digits than its factorization.

640028824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83370 (or 83366 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 640028824 is about 25298.7909592534. The cubic root of 640028824 is about 861.7868131988.

The spelling of 640028824 in words is "six hundred forty million, twenty-eight thousand, eight hundred twenty-four".