256997967 has 16 divisors (see below), whose sum is σ = 363282432. Its totient is φ = 161321760.

The previous prime is 256997957. The next prime is 256997969. The reversal of 256997967 is 769799652.

It is not a de Polignac number, because 256997967 - 2¹² = 256993871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256997967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256997969) 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 15 ways as a sum of consecutive naturals, for example, 33903 + ... + 40784.

It is an arithmetic number, because the mean of its divisors is an integer number (22705152).

Almost surely, 2^256997967 is an apocalyptic number.

256997967 is a deficient number, since it is larger than the sum of its proper divisors (106284465).

256997967 is a wasteful number, since it uses less digits than its factorization.

256997967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74758.

The product of its digits is 12859560, while the sum is 60.

The square root of 256997967 is about 16031.1561342281. The cubic root of 256997967 is about 635.7844415057.

The spelling of 256997967 in words is "two hundred fifty-six million, nine hundred ninety-seven thousand, nine hundred sixty-seven".