68506817 has 4 divisors (see below), whose sum is σ = 68523396. Its totient is φ = 68490240.

The previous prime is 68506759. The next prime is 68506831. The reversal of 68506817 is 71860586.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24960016 + 43546801 = 4996^2 + 6599^2 .

It is a cyclic number.

It is not a de Polignac number, because 68506817 - 2⁸ = 68506561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68506877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3473 + ... + 12209.

It is an arithmetic number, because the mean of its divisors is an integer number (17130849).

Almost surely, 2^68506817 is an apocalyptic number.

It is an amenable number.

68506817 is a deficient number, since it is larger than the sum of its proper divisors (16579).

68506817 is an equidigital number, since it uses as much as digits as its factorization.

68506817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16578.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 68506817 is about 8276.8844984088. The cubic root of 68506817 is about 409.1770464739.

The spelling of 68506817 in words is "sixty-eight million, five hundred six thousand, eight hundred seventeen".