63631986 has 32 divisors (see below), whose sum is σ = 147002688. Its totient is φ = 18147840.

The previous prime is 63631973. The next prime is 63631991. The reversal of 63631986 is 68913636.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27235 + ... + 29478.

It is an arithmetic number, because the mean of its divisors is an integer number (4593834).

Almost surely, 2^63631986 is an apocalyptic number.

63631986 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

63631986 is an abundant number, since it is smaller than the sum of its proper divisors (83370702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63631986 is a wasteful number, since it uses less digits than its factorization.

63631986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56746.

The product of its digits is 139968, while the sum is 42.

The square root of 63631986 is about 7976.9659645758. The cubic root of 63631986 is about 399.2318298977.

The spelling of 63631986 in words is "sixty-three million, six hundred thirty-one thousand, nine hundred eighty-six".