65679 has 4 divisors (see below), whose sum is σ = 87576. Its totient is φ = 43784.

The previous prime is 65677. The next prime is 65687. The reversal of 65679 is 97656.

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

It is a cyclic number.

It is not a de Polignac number, because 65679 - 2¹ = 65677 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65677) 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, 10944 + ... + 10949.

It is an arithmetic number, because the mean of its divisors is an integer number (21894).

2⁶⁵⁶⁷⁹ is an apocalyptic number.

65679 is a deficient number, since it is larger than the sum of its proper divisors (21897).

65679 is a wasteful number, since it uses less digits than its factorization.

65679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21896.

The product of its digits is 11340, while the sum is 33.

The square root of 65679 is about 256.2791446841. The cubic root of 65679 is about 40.3467766282.

The spelling of 65679 in words is "sixty-five thousand, six hundred seventy-nine".