63686217 has 8 divisors (see below), whose sum is σ = 97045696. Its totient is φ = 36392112.

The previous prime is 63686197. The next prime is 63686221. The reversal of 63686217 is 71268636.

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

It is not a de Polignac number, because 63686217 - 2⁶ = 63686153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63685217) 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, 1516318 + ... + 1516359.

It is an arithmetic number, because the mean of its divisors is an integer number (12130712).

Almost surely, 2^63686217 is an apocalyptic number.

It is an amenable number.

63686217 is a deficient number, since it is larger than the sum of its proper divisors (33359479).

63686217 is a wasteful number, since it uses less digits than its factorization.

63686217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032687.

The product of its digits is 72576, while the sum is 39.

The square root of 63686217 is about 7980.3644653612. The cubic root of 63686217 is about 399.3452141402.

It can be divided in two parts, 63686 and 217, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 63686217 in words is "sixty-three million, six hundred eighty-six thousand, two hundred seventeen".