256026761 has 4 divisors (see below), whose sum is σ = 264855300. Its totient is φ = 247198224.

The previous prime is 256026751. The next prime is 256026763. The reversal of 256026761 is 167620652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158886025 + 97140736 = 12605^2 + 9856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256026761 is a prime.

It is a super-2 number, since 2×256026761² = 131099404696302242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256026763) 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, 4414226 + ... + 4414283.

It is an arithmetic number, because the mean of its divisors is an integer number (66213825).

Almost surely, 2^256026761 is an apocalyptic number.

It is an amenable number.

256026761 is a deficient number, since it is larger than the sum of its proper divisors (8828539).

256026761 is an equidigital number, since it uses as much as digits as its factorization.

256026761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8828538.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 256026761 is about 16000.8362593959. The cubic root of 256026761 is about 634.9825452453.

The spelling of 256026761 in words is "two hundred fifty-six million, twenty-six thousand, seven hundred sixty-one".