63217865 has 4 divisors (see below), whose sum is σ = 75861444. Its totient is φ = 50574288.

The previous prime is 63217841. The next prime is 63217871. The reversal of 63217865 is 56871236.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12138256 + 51079609 = 3484^2 + 7147^2 .

It is a cyclic number.

It is not a de Polignac number, because 63217865 - 2⁶ = 63217801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6321782 + ... + 6321791.

It is an arithmetic number, because the mean of its divisors is an integer number (18965361).

Almost surely, 2^63217865 is an apocalyptic number.

It is an amenable number.

63217865 is a deficient number, since it is larger than the sum of its proper divisors (12643579).

63217865 is a wasteful number, since it uses less digits than its factorization.

63217865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12643578.

The product of its digits is 60480, while the sum is 38.

The square root of 63217865 is about 7950.9662934765. The cubic root of 63217865 is about 398.3638688954.

The spelling of 63217865 in words is "sixty-three million, two hundred seventeen thousand, eight hundred sixty-five".