256997726 has 8 divisors (see below), whose sum is σ = 385566480. Its totient is φ = 128475568.

The previous prime is 256997723. The next prime is 256997731. The reversal of 256997726 is 627799652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256997723) 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 3 ways as a sum of consecutive naturals, for example, 10775 + ... + 25101.

It is an arithmetic number, because the mean of its divisors is an integer number (48195810).

Almost surely, 2^256997726 is an apocalyptic number.

256997726 is a deficient number, since it is larger than the sum of its proper divisors (128568754).

256997726 is a wasteful number, since it uses less digits than its factorization.

256997726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23298.

The product of its digits is 2857680, while the sum is 53.

The square root of 256997726 is about 16031.1486176131. The cubic root of 256997726 is about 635.7842427699.

The spelling of 256997726 in words is "two hundred fifty-six million, nine hundred ninety-seven thousand, seven hundred twenty-six".