256997322 has 24 divisors (see below), whose sum is σ = 557129664. Its totient is φ = 85619304.

The previous prime is 256997309. The next prime is 256997353. The reversal of 256997322 is 223799652.

It is a happy number.

256997322 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 52053 + ... + 56775.

It is an arithmetic number, because the mean of its divisors is an integer number (23213736).

Almost surely, 2^256997322 is an apocalyptic number.

256997322 is an abundant number, since it is smaller than the sum of its proper divisors (300132342).

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

256997322 is a wasteful number, since it uses less digits than its factorization.

256997322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7754 (or 7751 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 256997322 is about 16031.1360171386. The cubic root of 256997322 is about 635.7839096192.

It can be divided in two parts, 256 and 997322, that added together give a triangular number (997578 = T₁₄₁₂).

The spelling of 256997322 in words is "two hundred fifty-six million, nine hundred ninety-seven thousand, three hundred twenty-two".