64523 has 4 divisors (see below), whose sum is σ = 65208. Its totient is φ = 63840.

The previous prime is 64513. The next prime is 64553. The reversal of 64523 is 32546.

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, and also an emirpimes, since its reverse is a distinct semiprime: 32546 = 2 ⋅16273.

It is a cyclic number.

It is not a de Polignac number, because 64523 - 2¹⁰ = 63499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64495 and 64504.

It is not an unprimeable number, because it can be changed into a prime (64513) 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, 173 + ... + 398.

It is an arithmetic number, because the mean of its divisors is an integer number (16302).

2⁶⁴⁵²³ is an apocalyptic number.

64523 is a deficient number, since it is larger than the sum of its proper divisors (685).

64523 is a wasteful number, since it uses less digits than its factorization.

64523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 720, while the sum is 20.

The square root of 64523 is about 254.0137791538. The cubic root of 64523 is about 40.1086628755.

The spelling of 64523 in words is "sixty-four thousand, five hundred twenty-three".