68307647 has 4 divisors (see below), whose sum is σ = 68327016. Its totient is φ = 68288280.

The previous prime is 68307571. The next prime is 68307689. The reversal of 68307647 is 74670386.

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 68307647 - 2¹⁸ = 68045503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68307697) 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, 2729 + ... + 12002.

It is an arithmetic number, because the mean of its divisors is an integer number (17081754).

Almost surely, 2^68307647 is an apocalyptic number.

68307647 is a deficient number, since it is larger than the sum of its proper divisors (19369).

68307647 is a wasteful number, since it uses less digits than its factorization.

68307647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19368.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 68307647 is about 8264.8440396658. The cubic root of 68307647 is about 408.7801278345.

The spelling of 68307647 in words is "sixty-eight million, three hundred seven thousand, six hundred forty-seven".