256620806 has 16 divisors (see below), whose sum is σ = 422365104. Its totient is φ = 116205024.

The previous prime is 256620779. The next prime is 256620809. The reversal of 256620806 is 608026652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256620809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91736 + ... + 94491.

It is an arithmetic number, because the mean of its divisors is an integer number (26397819).

Almost surely, 2^256620806 is an apocalyptic number.

256620806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

256620806 is a deficient number, since it is larger than the sum of its proper divisors (165744298).

256620806 is a wasteful number, since it uses less digits than its factorization.

256620806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186295.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 256620806 is about 16019.3884402620. The cubic root of 256620806 is about 635.4732710865.

The spelling of 256620806 in words is "two hundred fifty-six million, six hundred twenty thousand, eight hundred six".