64615 has 4 divisors (see below), whose sum is σ = 77544. Its totient is φ = 51688.

The previous prime is 64613. The next prime is 64621. The reversal of 64615 is 51646.

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 64615 - 2¹ = 64613 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64613) 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, 6457 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (19386).

2⁶⁴⁶¹⁵ is an apocalyptic number.

64615 is a deficient number, since it is larger than the sum of its proper divisors (12929).

64615 is a wasteful number, since it uses less digits than its factorization.

64615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12928.

The product of its digits is 720, while the sum is 22.

The square root of 64615 is about 254.1948071854. The cubic root of 64615 is about 40.1277167766.

The spelling of 64615 in words is "sixty-four thousand, six hundred fifteen".