64716689 has 4 divisors (see below), whose sum is σ = 64733424. Its totient is φ = 64699956.

The previous prime is 64716683. The next prime is 64716709. The reversal of 64716689 is 98661746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64716689 - 2²⁰ = 63668113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64716683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734 + ... + 11400.

It is an arithmetic number, because the mean of its divisors is an integer number (16183356).

Almost surely, 2^64716689 is an apocalyptic number.

It is an amenable number.

64716689 is a deficient number, since it is larger than the sum of its proper divisors (16735).

64716689 is a wasteful number, since it uses less digits than its factorization.

64716689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16734.

The product of its digits is 435456, while the sum is 47.

The square root of 64716689 is about 8044.6683586087. The cubic root of 64716689 is about 401.4875631155.

The spelling of 64716689 in words is "sixty-four million, seven hundred sixteen thousand, six hundred eighty-nine".