640327236 has 48 divisors (see below), whose sum is σ = 1608828480. Its totient is φ = 197478400.

The previous prime is 640327157. The next prime is 640327243. The reversal of 640327236 is 632723046.

It is a junction number, because it is equal to n+sod(n) for n = 640327197 and 640327206.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14565 + ... + 38636.

It is an arithmetic number, because the mean of its divisors is an integer number (33517260).

Almost surely, 2^640327236 is an apocalyptic number.

It is an amenable number.

640327236 is an abundant number, since it is smaller than the sum of its proper divisors (968501244).

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

640327236 is a wasteful number, since it uses less digits than its factorization.

640327236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53284 (or 53282 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 33.

The square root of 640327236 is about 25304.6880241587. The cubic root of 640327236 is about 861.9207277765.

The spelling of 640327236 in words is "six hundred forty million, three hundred twenty-seven thousand, two hundred thirty-six".