256355564 has 12 divisors (see below), whose sum is σ = 448971600. Its totient is φ = 128077968.

The previous prime is 256355537. The next prime is 256355591. The reversal of 256355564 is 465553652.

It is an interprime number because it is at equal distance from previous prime (256355537) and next prime (256355591).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19019 + ... + 29570.

It is an arithmetic number, because the mean of its divisors is an integer number (37414300).

Almost surely, 2^256355564 is an apocalyptic number.

It is an amenable number.

256355564 is a deficient number, since it is larger than the sum of its proper divisors (192616036).

256355564 is a wasteful number, since it uses less digits than its factorization.

256355564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49912 (or 49910 counting only the distinct ones).

The product of its digits is 540000, while the sum is 41.

The square root of 256355564 is about 16011.1075194691. The cubic root of 256355564 is about 635.2542549311.

The spelling of 256355564 in words is "two hundred fifty-six million, three hundred fifty-five thousand, five hundred sixty-four".