63634989 has 12 divisors (see below), whose sum is σ = 93261728. Its totient is φ = 38566440.

The previous prime is 63634973. The next prime is 63635003. The reversal of 63634989 is 98943636.

It is not a de Polignac number, because 63634989 - 2⁴ = 63634973 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63634939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87289 + ... + 88014.

Almost surely, 2^63634989 is an apocalyptic number.

It is an amenable number.

63634989 is a deficient number, since it is larger than the sum of its proper divisors (29626739).

63634989 is a wasteful number, since it uses less digits than its factorization.

63634989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175328 (or 175317 counting only the distinct ones).

The product of its digits is 839808, while the sum is 48.

The square root of 63634989 is about 7977.1541918155. The cubic root of 63634989 is about 399.2381101477.

The spelling of 63634989 in words is "sixty-three million, six hundred thirty-four thousand, nine hundred eighty-nine".