640089332 has 12 divisors (see below), whose sum is σ = 1120595616. Its totient is φ = 319919160.

The previous prime is 640089319. The next prime is 640089337. The reversal of 640089332 is 233980046.

It is a happy number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 640089292 and 640089301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640089337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19394 + ... + 40697.

It is an arithmetic number, because the mean of its divisors is an integer number (93382968).

Almost surely, 2^640089332 is an apocalyptic number.

It is an amenable number.

640089332 is a deficient number, since it is larger than the sum of its proper divisors (480506284).

640089332 is a wasteful number, since it uses less digits than its factorization.

640089332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62758 (or 62756 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 640089332 is about 25299.9867984155. The cubic root of 640089332 is about 861.8139699723.

The spelling of 640089332 in words is "six hundred forty million, eighty-nine thousand, three hundred thirty-two".