664615 has 16 divisors (see below), whose sum is σ = 965952. Its totient is φ = 428544.

The previous prime is 664613. The next prime is 664619. The reversal of 664615 is 516466.

It is a cyclic number.

It is not a de Polignac number, because 664615 - 2¹ = 664613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664613) 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, 37 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (60372).

2⁶⁶⁴⁶¹⁵ is an apocalyptic number.

664615 is a deficient number, since it is larger than the sum of its proper divisors (301337).

664615 is a wasteful number, since it uses less digits than its factorization.

664615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146.

The product of its digits is 4320, while the sum is 28.

The square root of 664615 is about 815.2392286930. The cubic root of 664615 is about 87.2683395903.

It can be divided in two parts, 66461 and 5, that added together give a palindrome (66466).

The spelling of 664615 in words is "six hundred sixty-four thousand, six hundred fifteen".