64815 has 16 divisors (see below), whose sum is σ = 108000. Its totient is φ = 33152.

The previous prime is 64811. The next prime is 64817. The reversal of 64815 is 51846.

64815 is nontrivially palindromic in base 12.

It is a cyclic number.

It is not a de Polignac number, because 64815 - 2² = 64811 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64815.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361 + ... + 509.

It is an arithmetic number, because the mean of its divisors is an integer number (6750).

2⁶⁴⁸¹⁵ is an apocalyptic number.

64815 is a deficient number, since it is larger than the sum of its proper divisors (43185).

64815 is a wasteful number, since it uses less digits than its factorization.

64815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its digits is 960, while the sum is 24.

The square root of 64815 is about 254.5879023049. The cubic root of 64815 is about 40.1690759924.

The spelling of 64815 in words is "sixty-four thousand, eight hundred fifteen".