640331282 has 16 divisors (see below), whose sum is σ = 1017514872. Its totient is φ = 301178880.

The previous prime is 640331239. The next prime is 640331297. The reversal of 640331282 is 282133046.

It can be written as a sum of positive squares in 4 ways, for example, as 626050441 + 14280841 = 25021^2 + 3779^2 .

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 7 ways as a sum of consecutive naturals, for example, 90182 + ... + 97022.

Almost surely, 2^640331282 is an apocalyptic number.

640331282 is a deficient number, since it is larger than the sum of its proper divisors (377183590).

640331282 is a wasteful number, since it uses less digits than its factorization.

640331282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9613.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 640331282 is about 25304.7679696930. The cubic root of 640331282 is about 861.9225431628.

The spelling of 640331282 in words is "six hundred forty million, three hundred thirty-one thousand, two hundred eighty-two".