256722 has 8 divisors (see below), whose sum is σ = 513456. Its totient is φ = 85572.

The previous prime is 256721. The next prime is 256723. The reversal of 256722 is 227652.

It is an interprime number because it is at equal distance from previous prime (256721) and next prime (256723).

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

256722 is an admirable number.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 256692 and 256701.

It is not an unprimeable number, because it can be changed into a prime (256721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21388 + ... + 21399.

It is an arithmetic number, because the mean of its divisors is an integer number (64182).

2²⁵⁶⁷²² is an apocalyptic number.

256722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256722 is a wasteful number, since it uses less digits than its factorization.

256722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42792.

The product of its digits is 1680, while the sum is 24.

The square root of 256722 is about 506.6774121668. The cubic root of 256722 is about 63.5556789427. Note that the first 3 decimals are identical.

The spelling of 256722 in words is "two hundred fifty-six thousand, seven hundred twenty-two".