256706357 has 4 divisors (see below), whose sum is σ = 256756800. Its totient is φ = 256655916.

The previous prime is 256706311. The next prime is 256706363. The reversal of 256706357 is 753607652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256706357 - 2⁶ = 256706293 is a prime.

It is a super-2 number, since 2×256706357² = 131796307448422898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256706557) 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, 16607 + ... + 28092.

It is an arithmetic number, because the mean of its divisors is an integer number (64189200).

Almost surely, 2^256706357 is an apocalyptic number.

It is an amenable number.

256706357 is a deficient number, since it is larger than the sum of its proper divisors (50443).

256706357 is an equidigital number, since it uses as much as digits as its factorization.

256706357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50442.

The product of its (nonzero) digits is 264600, while the sum is 41.

The square root of 256706357 is about 16022.0584507734. The cubic root of 256706357 is about 635.5438802399.

The spelling of 256706357 in words is "two hundred fifty-six million, seven hundred six thousand, three hundred fifty-seven".