256667622 has 16 divisors (see below), whose sum is σ = 514119792. Its totient is φ = 85425120.

The previous prime is 256667617. The next prime is 256667633. The reversal of 256667622 is 226766652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28393 + ... + 36324.

It is an arithmetic number, because the mean of its divisors is an integer number (32132487).

Almost surely, 2^256667622 is an apocalyptic number.

256667622 is an abundant number, since it is smaller than the sum of its proper divisors (257452170).

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

256667622 is a wasteful number, since it uses less digits than its factorization.

256667622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65383.

The product of its digits is 362880, while the sum is 42.

The square root of 256667622 is about 16020.8496029393. The cubic root of 256667622 is about 635.5119124164.

The spelling of 256667622 in words is "two hundred fifty-six million, six hundred sixty-seven thousand, six hundred twenty-two".