656722 has 8 divisors (see below), whose sum is σ = 1074672. Its totient is φ = 298500.

The previous prime is 656707. The next prime is 656737. The reversal of 656722 is 227656.

It is an interprime number because it is at equal distance from previous prime (656707) and next prime (656737).

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

It is an unprimeable number.

656722 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14904 + ... + 14947.

It is an arithmetic number, because the mean of its divisors is an integer number (134334).

2⁶⁵⁶⁷²² is an apocalyptic number.

656722 is a deficient number, since it is larger than the sum of its proper divisors (417950).

656722 is a wasteful number, since it uses less digits than its factorization.

656722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29864.

The product of its digits is 5040, while the sum is 28.

The square root of 656722 is about 810.3838596616. The cubic root of 656722 is about 86.9214952191.

It can be divided in two parts, 656 and 722, that added together give a triangular number (1378 = T₅₂).

The spelling of 656722 in words is "six hundred fifty-six thousand, seven hundred twenty-two".