68186813 has 8 divisors (see below), whose sum is σ = 73959480. Its totient is φ = 62609920.

The previous prime is 68186773. The next prime is 68186821. The reversal of 68186813 is 31868186.

It can be written as a sum of positive squares in 4 ways, for example, as 7689529 + 60497284 = 2773^2 + 7778^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68186813 - 2⁸ = 68186557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

68186813 is a modest number, since divided by 186813 gives 68 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68186873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48218 + ... + 49611.

It is an arithmetic number, because the mean of its divisors is an integer number (9244935).

Almost surely, 2^68186813 is an apocalyptic number.

It is an amenable number.

68186813 is a deficient number, since it is larger than the sum of its proper divisors (5772667).

68186813 is a wasteful number, since it uses less digits than its factorization.

68186813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97887.

The product of its digits is 55296, while the sum is 41.

The square root of 68186813 is about 8257.5306841695. The cubic root of 68186813 is about 408.5389459923.

It can be divided in two parts, 6818 and 6813, that added together give a palindrome (13631).

The spelling of 68186813 in words is "sixty-eight million, one hundred eighty-six thousand, eight hundred thirteen".