640073852 has 24 divisors (see below), whose sum is σ = 1228372992. Its totient is φ = 289415600.

The previous prime is 640073807. The next prime is 640073857. The reversal of 640073852 is 258370046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640073857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29678 + ... + 46485.

It is an arithmetic number, because the mean of its divisors is an integer number (51182208).

Almost surely, 2^640073852 is an apocalyptic number.

It is an amenable number.

640073852 is a deficient number, since it is larger than the sum of its proper divisors (588299140).

640073852 is a wasteful number, since it uses less digits than its factorization.

640073852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76369 (or 76367 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 640073852 is about 25299.6808675525. The cubic root of 640073852 is about 861.8070225109.

The spelling of 640073852 in words is "six hundred forty million, seventy-three thousand, eight hundred fifty-two".