68139356 has 6 divisors (see below), whose sum is σ = 119243880. Its totient is φ = 34069676.

The previous prime is 68139307. The next prime is 68139359. The reversal of 68139356 is 65393186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68139359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8517416 + ... + 8517423.

It is an arithmetic number, because the mean of its divisors is an integer number (19873980).

Almost surely, 2^68139356 is an apocalyptic number.

It is an amenable number.

68139356 is a deficient number, since it is larger than the sum of its proper divisors (51104524).

68139356 is a wasteful number, since it uses less digits than its factorization.

68139356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17034843 (or 17034841 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 68139356 is about 8254.6566252025. The cubic root of 68139356 is about 408.4441450009. Note that the first 3 decimals are identical.

The spelling of 68139356 in words is "sixty-eight million, one hundred thirty-nine thousand, three hundred fifty-six".