640213036 has 12 divisors (see below), whose sum is σ = 1120550760. Its totient is φ = 320055680.

The previous prime is 640213031. The next prime is 640213051. The reversal of 640213036 is 630312046.

It is a self number, because there is not a number n which added to its sum of digits gives 640213036.

It is not an unprimeable number, because it can be changed into a prime (640213031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38991 + ... + 52921.

It is an arithmetic number, because the mean of its divisors is an integer number (93379230).

Almost surely, 2^640213036 is an apocalyptic number.

It is an amenable number.

640213036 is a deficient number, since it is larger than the sum of its proper divisors (480337724).

640213036 is a wasteful number, since it uses less digits than its factorization.

640213036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25424 (or 25422 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 640213036 is about 25302.4314246675. The cubic root of 640213036 is about 861.8694846028.

The spelling of 640213036 in words is "six hundred forty million, two hundred thirteen thousand, thirty-six".