64819 has 4 divisors (see below), whose sum is σ = 66096. Its totient is φ = 63544.

The previous prime is 64817. The next prime is 64849. The reversal of 64819 is 91846.

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

It is a cyclic number.

It is not a de Polignac number, because 64819 - 2¹ = 64817 is a prime.

It is a super-2 number, since 2×64819² = 8403005522, which contains 22 as substring.

It is a Duffinian number.

64819 is a lucky number.

It is a plaindrome in base 11.

It is a nialpdrome in base 16.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (64811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559 + ... + 664.

It is an arithmetic number, because the mean of its divisors is an integer number (16524).

2⁶⁴⁸¹⁹ is an apocalyptic number.

64819 is a deficient number, since it is larger than the sum of its proper divisors (1277).

64819 is a wasteful number, since it uses less digits than its factorization.

64819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276.

The product of its digits is 1728, while the sum is 28.

The square root of 64819 is about 254.5957580165. The cubic root of 64819 is about 40.1699023084.

The spelling of 64819 in words is "sixty-four thousand, eight hundred nineteen".