256605822 has 24 divisors (see below), whose sum is σ = 606523320. Its totient is φ = 77759280.

The previous prime is 256605737. The next prime is 256605859. The reversal of 256605822 is 228506652.

256605822 is a `hidden beast` number, since 25 + 6 + 605 + 8 + 22 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 647797 + ... + 648192.

It is an arithmetic number, because the mean of its divisors is an integer number (25271805).

Almost surely, 2^256605822 is an apocalyptic number.

256605822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

256605822 is an abundant number, since it is smaller than the sum of its proper divisors (349917498).

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

256605822 is a wasteful number, since it uses less digits than its factorization.

256605822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296008 (or 1296005 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 256605822 is about 16018.9207501629. The cubic root of 256605822 is about 635.4609024910.

The spelling of 256605822 in words is "two hundred fifty-six million, six hundred five thousand, eight hundred twenty-two".