256197968 has 20 divisors (see below), whose sum is σ = 534567348. Its totient is φ = 118245120.

The previous prime is 256197967. The next prime is 256198003. The reversal of 256197968 is 869791652.

It can be written as a sum of positive squares in 2 ways, for example, as 12588304 + 243609664 = 3548^2 + 15608^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256197961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615653 + ... + 616068.

Almost surely, 2^256197968 is an apocalyptic number.

It is an amenable number.

256197968 is an abundant number, since it is smaller than the sum of its proper divisors (278369380).

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

256197968 is a wasteful number, since it uses less digits than its factorization.

256197968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231742 (or 1231736 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 256197968 is about 16006.1853044378. The cubic root of 256197968 is about 635.1240528917.

The spelling of 256197968 in words is "two hundred fifty-six million, one hundred ninety-seven thousand, nine hundred sixty-eight".