65279 has 4 divisors (see below), whose sum is σ = 67560. Its totient is φ = 63000.

The previous prime is 65269. The next prime is 65287. The reversal of 65279 is 97256.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65279 is a prime.

It is a super-2 number, since 2×65279² = 8522695682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2251 = 65279 / (6 + 5 + 2 + 7 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65239) 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, 1097 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (16890).

2⁶⁵²⁷⁹ is an apocalyptic number.

65279 is a deficient number, since it is larger than the sum of its proper divisors (2281).

65279 is a wasteful number, since it uses less digits than its factorization.

65279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280.

The product of its digits is 3780, while the sum is 29.

The square root of 65279 is about 255.4975538043. The cubic root of 65279 is about 40.2647027803.

The spelling of 65279 in words is "sixty-five thousand, two hundred seventy-nine".