63856081 has 9 divisors (see below), whose sum is σ = 65419419. Its totient is φ = 62329800.

The previous prime is 63856061. The next prime is 63856087. The reversal of 63856081 is 18065836.

The square root of 63856081 is 7991.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2076481 + 61779600 = 1441^2 + 7860^2 .

It is not a de Polignac number, because 63856081 - 2⁵ = 63856049 is a prime.

It is a super-2 number, since 2×63856081² = 8155198161357122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63856081.

It is not an unprimeable number, because it can be changed into a prime (63856087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 487386 + ... + 487516.

Almost surely, 2^63856081 is an apocalyptic number.

63856081 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

63856081 is the 7991-st square number.

63856081 is the 3996-th centered octagonal number.

It is an amenable number.

63856081 is a deficient number, since it is larger than the sum of its proper divisors (1563338).

63856081 is an frugal number, since it uses more digits than its factorization.

63856081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The cubic root of 63856081 is about 399.6999437219.

The spelling of 63856081 in words is "sixty-three million, eight hundred fifty-six thousand, eighty-one".