640812052 has 12 divisors (see below), whose sum is σ = 1122247476. Its totient is φ = 320169920.

The previous prime is 640812017. The next prime is 640812061. The reversal of 640812052 is 250218046.

It can be written as a sum of positive squares in 2 ways, for example, as 632723716 + 8088336 = 25154^2 + 2844^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 640812052.

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, 52849 + ... + 63832.

It is an arithmetic number, because the mean of its divisors is an integer number (93520623).

Almost surely, 2^640812052 is an apocalyptic number.

It is an amenable number.

640812052 is a deficient number, since it is larger than the sum of its proper divisors (481435424).

640812052 is a wasteful number, since it uses less digits than its factorization.

640812052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118058 (or 118056 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 640812052 is about 25314.2657803856. The cubic root of 640812052 is about 862.1382038408.

The spelling of 640812052 in words is "six hundred forty million, eight hundred twelve thousand, fifty-two".