256105664 has 28 divisors (see below), whose sum is σ = 511594608. Its totient is φ = 127200000.

The previous prime is 256105651. The next prime is 256105669. The reversal of 256105664 is 466501652.

256105664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256105664² = 131180222265761792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256105669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3587 + ... + 22914.

It is an arithmetic number, because the mean of its divisors is an integer number (18271236).

Almost surely, 2^256105664 is an apocalyptic number.

It is an amenable number.

256105664 is a deficient number, since it is larger than the sum of its proper divisors (255488944).

256105664 is a wasteful number, since it uses less digits than its factorization.

256105664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26664 (or 26654 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 256105664 is about 16003.3016593452. The cubic root of 256105664 is about 635.0477687420.

The spelling of 256105664 in words is "two hundred fifty-six million, one hundred five thousand, six hundred sixty-four".