1640317256 has 16 divisors (see below), whose sum is σ = 3181650300. Its totient is φ = 791877184.

The previous prime is 1640317247. The next prime is 1640317279. The reversal of 1640317256 is 6527130461.

It can be written as a sum of positive squares in 2 ways, for example, as 1538992900 + 101324356 = 39230^2 + 10066^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3534935 + ... + 3535398.

Almost surely, 2^1640317256 is an apocalyptic number.

It is an amenable number.

1640317256 is a deficient number, since it is larger than the sum of its proper divisors (1541333044).

1640317256 is a wasteful number, since it uses less digits than its factorization.

1640317256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070368 (or 7070364 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1640317256 is about 40500.8303124763. The cubic root of 1640317256 is about 1179.3497461113.

The spelling of 1640317256 in words is "one billion, six hundred forty million, three hundred seventeen thousand, two hundred fifty-six".