68742679 has 4 divisors (see below), whose sum is σ = 72786384. Its totient is φ = 64698976.

The previous prime is 68742671. The next prime is 68742701. The reversal of 68742679 is 97624786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68742679 - 2³ = 68742671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68742671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021827 + ... + 2021860.

It is an arithmetic number, because the mean of its divisors is an integer number (18196596).

Almost surely, 2^68742679 is an apocalyptic number.

68742679 is a deficient number, since it is larger than the sum of its proper divisors (4043705).

68742679 is a wasteful number, since it uses less digits than its factorization.

68742679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043704.

The product of its digits is 1016064, while the sum is 49.

The square root of 68742679 is about 8291.1204912243. The cubic root of 68742679 is about 409.6460935695.

The spelling of 68742679 in words is "sixty-eight million, seven hundred forty-two thousand, six hundred seventy-nine".