256068638 has 16 divisors (see below), whose sum is σ = 450839904. Its totient is φ = 106777440.

The previous prime is 256068613. The next prime is 256068661. The reversal of 256068638 is 836860652.

256068638 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 2×256068638² = 131142294734350088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246653 + ... + 247688.

It is an arithmetic number, because the mean of its divisors is an integer number (28177494).

Almost surely, 2^256068638 is an apocalyptic number.

256068638 is a deficient number, since it is larger than the sum of its proper divisors (194771266).

256068638 is a wasteful number, since it uses less digits than its factorization.

256068638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494387.

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 256068638 is about 16002.1447937456. The cubic root of 256068638 is about 635.0171636504.

The spelling of 256068638 in words is "two hundred fifty-six million, sixty-eight thousand, six hundred thirty-eight".