65623 has 4 divisors (see below), whose sum is σ = 66240. Its totient is φ = 65008.

The previous prime is 65617. The next prime is 65629. The reversal of 65623 is 32656.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (65617) and next prime (65629).

It is a cyclic number.

It is not a de Polignac number, because 65623 - 2⁹ = 65111 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 65594 and 65603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65629) 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, 103 + ... + 376.

It is an arithmetic number, because the mean of its divisors is an integer number (16560).

2⁶⁵⁶²³ is an apocalyptic number.

65623 is a deficient number, since it is larger than the sum of its proper divisors (617).

65623 is a wasteful number, since it uses less digits than its factorization.

65623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its digits is 1080, while the sum is 22.

The square root of 65623 is about 256.1698655190. The cubic root of 65623 is about 40.3353063868.

The spelling of 65623 in words is "sixty-five thousand, six hundred twenty-three".