256229646 has 16 divisors (see below), whose sum is σ = 520861008. Its totient is φ = 84009600.

The previous prime is 256229629. The next prime is 256229657. The reversal of 256229646 is 646922652.

It is a junction number, because it is equal to n+sod(n) for n = 256229598 and 256229607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349675 + ... + 350406.

It is an arithmetic number, because the mean of its divisors is an integer number (32553813).

Almost surely, 2^256229646 is an apocalyptic number.

256229646 is an abundant number, since it is smaller than the sum of its proper divisors (264631362).

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

256229646 is a wasteful number, since it uses less digits than its factorization.

256229646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700147.

The product of its digits is 311040, while the sum is 42.

The square root of 256229646 is about 16007.1748288072. The cubic root of 256229646 is about 635.1502287832.

The spelling of 256229646 in words is "two hundred fifty-six million, two hundred twenty-nine thousand, six hundred forty-six".