256297578 has 16 divisors (see below), whose sum is σ = 517573056. Its totient is φ = 84602880.

The previous prime is 256297577. The next prime is 256297583. The reversal of 256297578 is 875792652.

It is a super-3 number, since 3×256297578³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256297578.

It is not an unprimeable number, because it can be changed into a prime (256297577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206743 + ... + 207978.

It is an arithmetic number, because the mean of its divisors is an integer number (32348316).

Almost surely, 2^256297578 is an apocalyptic number.

256297578 is an abundant number, since it is smaller than the sum of its proper divisors (261275478).

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

256297578 is a wasteful number, since it uses less digits than its factorization.

256297578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414829.

The product of its digits is 2116800, while the sum is 51.

The square root of 256297578 is about 16009.2966116566. The cubic root of 256297578 is about 635.2063544937.

The spelling of 256297578 in words is "two hundred fifty-six million, two hundred ninety-seven thousand, five hundred seventy-eight".