664268 has 24 divisors (see below), whose sum is σ = 1311744. Its totient is φ = 291600.

The previous prime is 664253. The next prime is 664271. The reversal of 664268 is 862466.

It is a happy number.

It is a d-powerful number, because it can be written as 6⁶ + 6⁶ + 2¹⁹ + 4 + 6⁶ + 8 .

It is an unprimeable number.

664268 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121 + ... + 1607.

It is an arithmetic number, because the mean of its divisors is an integer number (54656).

2⁶⁶⁴²⁶⁸ is an apocalyptic number.

It is an amenable number.

664268 is a deficient number, since it is larger than the sum of its proper divisors (647476).

664268 is a wasteful number, since it uses less digits than its factorization.

664268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 531 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 664268 is about 815.0263799412. The cubic root of 664268 is about 87.2531491489.

It can be divided in two parts, 66 and 4268, that added together give a palindrome (4334).

The spelling of 664268 in words is "six hundred sixty-four thousand, two hundred sixty-eight".