63709989 has 16 divisors (see below), whose sum is σ = 97320960. Its totient is φ = 36316080.

The previous prime is 63709981. The next prime is 63710039. The reversal of 63709989 is 98990736.

It is not a de Polignac number, because 63709989 - 2³ = 63709981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63709981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5532 + ... + 12570.

It is an arithmetic number, because the mean of its divisors is an integer number (6082560).

Almost surely, 2^63709989 is an apocalyptic number.

It is an amenable number.

63709989 is a deficient number, since it is larger than the sum of its proper divisors (33610971).

63709989 is a wasteful number, since it uses less digits than its factorization.

63709989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7480.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 63709989 is about 7981.8537320600. The cubic root of 63709989 is about 399.3948954996.

The spelling of 63709989 in words is "sixty-three million, seven hundred nine thousand, nine hundred eighty-nine".