256365890 has 32 divisors (see below), whose sum is σ = 504302976. Its totient is φ = 93058560.

The previous prime is 256365881. The next prime is 256365931. The reversal of 256365890 is 98563652.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72299 + ... + 75761.

It is an arithmetic number, because the mean of its divisors is an integer number (15759468).

Almost surely, 2^256365890 is an apocalyptic number.

256365890 is a deficient number, since it is larger than the sum of its proper divisors (247937086).

256365890 is a wasteful number, since it uses less digits than its factorization.

256365890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 256365890 is about 16011.4299798613. The cubic root of 256365890 is about 635.2627841619.

The spelling of 256365890 in words is "two hundred fifty-six million, three hundred sixty-five thousand, eight hundred ninety".