64565 has 8 divisors (see below), whose sum is σ = 79800. Its totient is φ = 50112.

The previous prime is 64553. The next prime is 64567. The reversal of 64565 is 56546.

It can be written as a sum of positive squares in 4 ways, for example, as 24964 + 39601 = 158^2 + 199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64565 - 2¹⁰ = 63541 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11 + ... + 359.

It is an arithmetic number, because the mean of its divisors is an integer number (9975).

2⁶⁴⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

64565 is a deficient number, since it is larger than the sum of its proper divisors (15235).

64565 is a wasteful number, since it uses less digits than its factorization.

64565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391.

The product of its digits is 3600, while the sum is 26.

The square root of 64565 is about 254.0964383851. The cubic root of 64565 is about 40.1173636409.

The spelling of 64565 in words is "sixty-four thousand, five hundred sixty-five".