256497268 has 6 divisors (see below), whose sum is σ = 448870226. Its totient is φ = 128248632.

The previous prime is 256497251. The next prime is 256497287. The reversal of 256497268 is 862794652.

It can be written as a sum of positive squares in only one way, i.e., 227466724 + 29030544 = 15082^2 + 5388^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32062155 + ... + 32062162.

Almost surely, 2^256497268 is an apocalyptic number.

It is an amenable number.

256497268 is a deficient number, since it is larger than the sum of its proper divisors (192372958).

256497268 is a wasteful number, since it uses less digits than its factorization.

256497268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64124321 (or 64124319 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The square root of 256497268 is about 16015.5320860719. The cubic root of 256497268 is about 635.3712818271.

The spelling of 256497268 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, two hundred sixty-eight".