63686813 has 8 divisors (see below), whose sum is σ = 66679200. Its totient is φ = 60747568.

The previous prime is 63686807. The next prime is 63686851. The reversal of 63686813 is 31868636.

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 63686813 - 2⁴ = 63686797 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 (63286813) 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, 10823 + ... + 15636.

It is an arithmetic number, because the mean of its divisors is an integer number (8334900).

Almost surely, 2^63686813 is an apocalyptic number.

It is an amenable number.

63686813 is a deficient number, since it is larger than the sum of its proper divisors (2992387).

63686813 is a wasteful number, since it uses less digits than its factorization.

63686813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26571.

The product of its digits is 124416, while the sum is 41.

The square root of 63686813 is about 7980.4018069268. The cubic root of 63686813 is about 399.3464598781.

The spelling of 63686813 in words is "sixty-three million, six hundred eighty-six thousand, eight hundred thirteen".