63639081 has 48 divisors (see below), whose sum is σ = 106169280. Its totient is φ = 37359360.

The previous prime is 63639067. The next prime is 63639083. The reversal of 63639081 is 18093636.

It is a happy number.

63639081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63639081 - 2⁵ = 63639049 is a prime.

It is a super-2 number, since 2×63639081² = 8099865261049122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63639083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 656025 + ... + 656121.

It is an arithmetic number, because the mean of its divisors is an integer number (2211860).

Almost surely, 2^63639081 is an apocalyptic number.

It is an amenable number.

63639081 is a deficient number, since it is larger than the sum of its proper divisors (42530199).

63639081 is a wasteful number, since it uses less digits than its factorization.

63639081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 63639081 is about 7977.4106701360. The cubic root of 63639081 is about 399.2466675328.

The spelling of 63639081 in words is "sixty-three million, six hundred thirty-nine thousand, eighty-one".