64569 has 4 divisors (see below), whose sum is σ = 86096. Its totient is φ = 43044.

The previous prime is 64567. The next prime is 64577. The reversal of 64569 is 96546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64569 - 2¹ = 64567 is a prime.

It is a super-2 number, since 2×64569² = 8338311522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 11.

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 3 ways as a sum of consecutive naturals, for example, 10759 + ... + 10764.

It is an arithmetic number, because the mean of its divisors is an integer number (21524).

2⁶⁴⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

64569 is a deficient number, since it is larger than the sum of its proper divisors (21527).

64569 is a wasteful number, since it uses less digits than its factorization.

64569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21526.

The product of its digits is 6480, while the sum is 30.

The square root of 64569 is about 254.1043092905. The cubic root of 64569 is about 40.1181920884.

The spelling of 64569 in words is "sixty-four thousand, five hundred sixty-nine".