664893 has 6 divisors (see below), whose sum is σ = 960414. Its totient is φ = 443256.

The previous prime is 664891. The next prime is 664933. The reversal of 664893 is 398466.

664893 is a `hidden beast` number, since 6 + 648 + 9 + 3 = 666.

664893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 459684 + 205209 = 678^2 + 453^2 .

It is not a de Polignac number, because 664893 - 2¹ = 664891 is a prime.

It is a Curzon number.

664893 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36930 + ... + 36947.

It is an arithmetic number, because the mean of its divisors is an integer number (160069).

2⁶⁶⁴⁸⁹³ is an apocalyptic number.

It is an amenable number.

664893 is a deficient number, since it is larger than the sum of its proper divisors (295521).

664893 is a wasteful number, since it uses less digits than its factorization.

664893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73883 (or 73880 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 664893 is about 815.4097129664. The cubic root of 664893 is about 87.2805056396.

The spelling of 664893 in words is "six hundred sixty-four thousand, eight hundred ninety-three".