256817332 has 12 divisors (see below), whose sum is σ = 454480740. Its totient is φ = 126965696.

The previous prime is 256817321. The next prime is 256817347. The reversal of 256817332 is 233718652.

It can be written as a sum of positive squares in 2 ways, for example, as 66487716 + 190329616 = 8154^2 + 13796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 256817291 and 256817300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360343 + ... + 361054.

It is an arithmetic number, because the mean of its divisors is an integer number (37873395).

Almost surely, 2^256817332 is an apocalyptic number.

It is an amenable number.

256817332 is a deficient number, since it is larger than the sum of its proper divisors (197663408).

256817332 is a wasteful number, since it uses less digits than its factorization.

256817332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721490 (or 721488 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 256817332 is about 16025.5212707731. The cubic root of 256817332 is about 635.6354496138.

It can be divided in two parts, 2568 and 17332, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 256817332 in words is "two hundred fifty-six million, eight hundred seventeen thousand, three hundred thirty-two".