63856213 has 4 divisors (see below), whose sum is σ = 64130508. Its totient is φ = 63581920.

The previous prime is 63856201. The next prime is 63856223. The reversal of 63856213 is 31265836.

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 35319249 + 28536964 = 5943^2 + 5342^2 .

It is a cyclic number.

It is not a de Polignac number, because 63856213 - 2¹³ = 63848021 is a prime.

It is a super-3 number, since 3×63856213³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63856223) 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, 136798 + ... + 137263.

It is an arithmetic number, because the mean of its divisors is an integer number (16032627).

Almost surely, 2^63856213 is an apocalyptic number.

It is an amenable number.

63856213 is a deficient number, since it is larger than the sum of its proper divisors (274295).

63856213 is a wasteful number, since it uses less digits than its factorization.

63856213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274294.

The product of its digits is 25920, while the sum is 34.

The square root of 63856213 is about 7991.0082592874. The cubic root of 63856213 is about 399.7002191347.

The spelling of 63856213 in words is "sixty-three million, eight hundred fifty-six thousand, two hundred thirteen".