640231316 has 12 divisors (see below), whose sum is σ = 1135753332. Its totient is φ = 315730368.

The previous prime is 640231303. The next prime is 640231327. The reversal of 640231316 is 613132046.

It can be written as a sum of positive squares in 2 ways, for example, as 294122500 + 346108816 = 17150^2 + 18604^2 .

It is a super-2 number, since 2×640231316² = 819792275974183712, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1095995 + ... + 1096578.

It is an arithmetic number, because the mean of its divisors is an integer number (94646111).

Almost surely, 2^640231316 is an apocalyptic number.

It is an amenable number.

640231316 is a deficient number, since it is larger than the sum of its proper divisors (495522016).

640231316 is a wasteful number, since it uses less digits than its factorization.

640231316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192650 (or 2192648 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 640231316 is about 25302.7926521955. The cubic root of 640231316 is about 861.8776875099.

The spelling of 640231316 in words is "six hundred forty million, two hundred thirty-one thousand, three hundred sixteen".