68256681 has 16 divisors (see below), whose sum is σ = 92695680. Its totient is φ = 44668800.

The previous prime is 68256667. The next prime is 68256697. The reversal of 68256681 is 18665286.

It is not a de Polignac number, because 68256681 - 2¹⁴ = 68240297 is a prime.

It is a super-2 number, since 2×68256681² = 9317949002271522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68256611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39471 + ... + 41163.

It is an arithmetic number, because the mean of its divisors is an integer number (5793480).

Almost surely, 2^68256681 is an apocalyptic number.

It is an amenable number.

68256681 is a deficient number, since it is larger than the sum of its proper divisors (24438999).

68256681 is a wasteful number, since it uses less digits than its factorization.

68256681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its digits is 138240, while the sum is 42.

The square root of 68256681 is about 8261.7601635487. The cubic root of 68256681 is about 408.6784356003.

The spelling of 68256681 in words is "sixty-eight million, two hundred fifty-six thousand, six hundred eighty-one".