64865 has 4 divisors (see below), whose sum is σ = 77844. Its totient is φ = 51888.

The previous prime is 64853. The next prime is 64871. The reversal of 64865 is 56846.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7744 + 57121 = 88^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 64865 - 2⁴ = 64849 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6482 + ... + 6491.

It is an arithmetic number, because the mean of its divisors is an integer number (19461).

2⁶⁴⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

64865 is a deficient number, since it is larger than the sum of its proper divisors (12979).

64865 is a wasteful number, since it uses less digits than its factorization.

64865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12978.

The product of its digits is 5760, while the sum is 29.

The square root of 64865 is about 254.6860812844. The cubic root of 64865 is about 40.1794024990.

It can be divided in two parts, 64 and 865, that added together give a palindrome (929).

The spelling of 64865 in words is "sixty-four thousand, eight hundred sixty-five".