65988689 has 4 divisors (see below), whose sum is σ = 71064756. Its totient is φ = 60912624.

The previous prime is 65988647. The next prime is 65988731. The reversal of 65988689 is 98688956.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (65988647) and next prime (65988731).

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 57532225 = 2908^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 65988689 - 2²⁴ = 49211473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65988619) 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, 2538014 + ... + 2538039.

It is an arithmetic number, because the mean of its divisors is an integer number (17766189).

Almost surely, 2^65988689 is an apocalyptic number.

It is an amenable number.

65988689 is a deficient number, since it is larger than the sum of its proper divisors (5076067).

65988689 is a wasteful number, since it uses less digits than its factorization.

65988689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076066.

The product of its digits is 7464960, while the sum is 59.

The square root of 65988689 is about 8123.3422308801. The cubic root of 65988689 is about 404.1009146494.

The spelling of 65988689 in words is "sixty-five million, nine hundred eighty-eight thousand, six hundred eighty-nine".