63681881 has 8 divisors (see below), whose sum is σ = 67572000. Its totient is φ = 59807808.

The previous prime is 63681853. The next prime is 63681889. The reversal of 63681881 is 18818636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63681881 - 2¹⁰ = 63680857 is a prime.

It is a super-2 number, since 2×63681881² = 8110763935396322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63681889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4730 + ... + 12236.

It is an arithmetic number, because the mean of its divisors is an integer number (8446500).

Almost surely, 2^63681881 is an apocalyptic number.

It is an amenable number.

63681881 is a deficient number, since it is larger than the sum of its proper divisors (3890119).

63681881 is a wasteful number, since it uses less digits than its factorization.

63681881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8023.

The product of its digits is 55296, while the sum is 41.

The square root of 63681881 is about 7980.0927939467. The cubic root of 63681881 is about 399.3361509539.

The spelling of 63681881 in words is "sixty-three million, six hundred eighty-one thousand, eight hundred eighty-one".