63689906 has 12 divisors (see below), whose sum is σ = 111132558. Its totient is φ = 27295632.

The previous prime is 63689891. The next prime is 63689953. The reversal of 63689906 is 60998636.

It can be written as a sum of positive squares in only one way, i.e., 36493681 + 27196225 = 6041^2 + 5215^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 324851 + ... + 325046.

Almost surely, 2^63689906 is an apocalyptic number.

63689906 is a deficient number, since it is larger than the sum of its proper divisors (47442652).

63689906 is a wasteful number, since it uses less digits than its factorization.

63689906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649913 (or 649906 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 63689906 is about 7980.5955918089. The cubic root of 63689906 is about 399.3529246314.

The spelling of 63689906 in words is "sixty-three million, six hundred eighty-nine thousand, nine hundred six".