64809 has 12 divisors (see below), whose sum is σ = 98800.
Its totient is φ = 40824.
The previous prime is 64793. The next prime is 64811. The reversal of 64809 is 90846.
It is not a de Polignac number, because 64809 - 24 = 64793 is a prime.
It is an Ulam number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64809.
It is not an unprimeable number, because it can be changed into a prime (64849) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19 + ... + 360.
264809 is an apocalyptic number.
It is an amenable number.
64809 is a deficient number, since it is larger than the sum of its proper divisors (33991).
64809 is a wasteful number, since it uses less digits than its factorization.
64809 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 404 (or 401 counting only the distinct ones).
The product of its (nonzero) digits is 1728, while the sum is 27.
The square root of 64809 is about 254.5761182829.
The cubic root of 64809 is about 40.1678364548.
The spelling of 64809 in words is "sixty-four thousand, eight hundred nine".