256495668 has 96 divisors (see below), whose sum is σ = 740221440. Its totient is φ = 67962240.

The previous prime is 256495663. The next prime is 256495703. The reversal of 256495668 is 866594652.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 256495668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256495663) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 28671 + ... + 36537.

It is an arithmetic number, because the mean of its divisors is an integer number (7710640).

Almost surely, 2^256495668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256495668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370110720).

256495668 is an abundant number, since it is smaller than the sum of its proper divisors (483725772).

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

256495668 is a wasteful number, since it uses less digits than its factorization.

256495668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7917 (or 7915 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 51.

The square root of 256495668 is about 16015.4821344847. The cubic root of 256495668 is about 635.3699607004.

The spelling of 256495668 in words is "two hundred fifty-six million, four hundred ninety-five thousand, six hundred sixty-eight".