68256891 has 8 divisors (see below), whose sum is σ = 101121360. Its totient is φ = 45504576.

The previous prime is 68256889. The next prime is 68256901. The reversal of 68256891 is 19865286.

68256891 is a `hidden beast` number, since 6 + 82 + 568 + 9 + 1 = 666.

It is not a de Polignac number, because 68256891 - 2¹ = 68256889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68256871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1263990 + ... + 1264043.

It is an arithmetic number, because the mean of its divisors is an integer number (12640170).

Almost surely, 2^68256891 is an apocalyptic number.

68256891 is a deficient number, since it is larger than the sum of its proper divisors (32864469).

68256891 is a wasteful number, since it uses less digits than its factorization.

68256891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528042 (or 2528036 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 68256891 is about 8261.7728726951. The cubic root of 68256891 is about 408.6788547162.

The spelling of 68256891 in words is "sixty-eight million, two hundred fifty-six thousand, eight hundred ninety-one".