640038752 has 24 divisors (see below), whose sum is σ = 1269703512. Its totient is φ = 317574400.

The previous prime is 640038727. The next prime is 640038757. The reversal of 640038752 is 257830046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640038757) 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 3 ways as a sum of consecutive naturals, for example, 72149 + ... + 80532.

It is an arithmetic number, because the mean of its divisors is an integer number (52904313).

Almost surely, 2^640038752 is an apocalyptic number.

It is an amenable number.

640038752 is a deficient number, since it is larger than the sum of its proper divisors (629664760).

640038752 is a wasteful number, since it uses less digits than its factorization.

640038752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152822 (or 152814 counting only the distinct ones).

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

The square root of 640038752 is about 25298.9871734028. The cubic root of 640038752 is about 861.7912691311.

Adding to 640038752 its reverse (257830046), we get a palindrome (897868798).

The spelling of 640038752 in words is "six hundred forty million, thirty-eight thousand, seven hundred fifty-two".