63916881 has 16 divisors (see below), whose sum is σ = 97574784. Its totient is φ = 36457344.

The previous prime is 63916873. The next prime is 63916903. The reversal of 63916881 is 18861936.

It is not a de Polignac number, because 63916881 - 2³ = 63916873 is a prime.

It is a super-2 number, since 2×63916881² = 8170735353536322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63916681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10491 + ... + 15423.

It is an arithmetic number, because the mean of its divisors is an integer number (6098424).

Almost surely, 2^63916881 is an apocalyptic number.

It is an amenable number.

63916881 is a deficient number, since it is larger than the sum of its proper divisors (33657903).

63916881 is a wasteful number, since it uses less digits than its factorization.

63916881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560.

The product of its digits is 62208, while the sum is 42.

The square root of 63916881 is about 7994.8033746928. The cubic root of 63916881 is about 399.8267603976.

The spelling of 63916881 in words is "sixty-three million, nine hundred sixteen thousand, eight hundred eighty-one".