68139827 has 16 divisors (see below), whose sum is σ = 80402112. Its totient is φ = 56532480.

The previous prime is 68139817. The next prime is 68139839. The reversal of 68139827 is 72893186.

It is a cyclic number.

It is not a de Polignac number, because 68139827 - 2⁴ = 68139811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68139817) 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, 38453 + ... + 40185.

It is an arithmetic number, because the mean of its divisors is an integer number (5025132).

Almost surely, 2^68139827 is an apocalyptic number.

68139827 is a deficient number, since it is larger than the sum of its proper divisors (12262285).

68139827 is a wasteful number, since it uses less digits than its factorization.

68139827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918.

The product of its digits is 145152, while the sum is 44.

The square root of 68139827 is about 8254.6851545047. The cubic root of 68139827 is about 408.4450860956.

The spelling of 68139827 in words is "sixty-eight million, one hundred thirty-nine thousand, eight hundred twenty-seven".