256294566 has 96 divisors (see below), whose sum is σ = 637797888. Its totient is φ = 73624320.

The previous prime is 256294561. The next prime is 256294573. The reversal of 256294566 is 665492652.

It is a happy number.

256294566 is a `hidden beast` number, since 25 + 62 + 9 + 4 + 566 = 666.

It is a super-2 number, since 2×256294566² = 131373809122256712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256294561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 760350 + ... + 760686.

It is an arithmetic number, because the mean of its divisors is an integer number (6643728).

Almost surely, 2^256294566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256294566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318898944).

256294566 is an abundant number, since it is smaller than the sum of its proper divisors (381503322).

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

256294566 is a wasteful number, since it uses less digits than its factorization.

256294566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 543 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 256294566 is about 16009.2025410387. The cubic root of 256294566 is about 635.2038661765.

The spelling of 256294566 in words is "two hundred fifty-six million, two hundred ninety-four thousand, five hundred sixty-six".