63678681 has 24 divisors (see below), whose sum is σ = 103584000. Its totient is φ = 37346400.

The previous prime is 63678673. The next prime is 63678683. The reversal of 63678681 is 18687636.

63678681 is a `hidden beast` number, since 636 + 7 + 8 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 63678681 - 2³ = 63678673 is a prime.

It is a super-2 number, since 2×63678681² = 8109948827799522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63678683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7306 + ... + 13443.

It is an arithmetic number, because the mean of its divisors is an integer number (4316000).

Almost surely, 2^63678681 is an apocalyptic number.

It is an amenable number.

63678681 is a deficient number, since it is larger than the sum of its proper divisors (39905319).

63678681 is a wasteful number, since it uses less digits than its factorization.

63678681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20797 (or 20794 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 63678681 is about 7979.8922925062. The cubic root of 63678681 is about 399.3294619917.

The spelling of 63678681 in words is "sixty-three million, six hundred seventy-eight thousand, six hundred eighty-one".