640630232 has 32 divisors (see below), whose sum is σ = 1312286400. Its totient is φ = 290772000.

The previous prime is 640630223. The next prime is 640630241. The reversal of 640630232 is 232036046.

It is an interprime number because it is at equal distance from previous prime (640630223) and next prime (640630241).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 60107 + ... + 69957.

It is an arithmetic number, because the mean of its divisors is an integer number (41008950).

Almost surely, 2^640630232 is an apocalyptic number.

It is an amenable number.

640630232 is an abundant number, since it is smaller than the sum of its proper divisors (671656168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640630232 is a wasteful number, since it uses less digits than its factorization.

640630232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607 (or 10603 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 640630232 is about 25310.6742699597. The cubic root of 640630232 is about 862.0566568955.

Adding to 640630232 its reverse (232036046), we get a palindrome (872666278).

The spelling of 640630232 in words is "six hundred forty million, six hundred thirty thousand, two hundred thirty-two".