622656 has 84 divisors (see below), whose sum is σ = 1901952. Its totient is φ = 194304.

The previous prime is 622639. The next prime is 622663. The reversal of 622656 is 656226.

622656 = T₁₄₁ + T₁₄₂ + ... + T₁₈₆.

622656 is a `hidden beast` number, since 6 + 2 + 2 + 656 = 666.

It is a congruent number.

It is an unprimeable number.

622656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13225 + ... + 13271.

2⁶²²⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 622656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950976).

622656 is an abundant number, since it is smaller than the sum of its proper divisors (1279296).

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

622656 is a wasteful number, since it uses less digits than its factorization.

622656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 75 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 622656 is about 789.0855466931. The cubic root of 622656 is about 85.3917785379.

The spelling of 622656 in words is "six hundred twenty-two thousand, six hundred fifty-six".