664264 has 16 divisors (see below), whose sum is σ = 1275120. Its totient is φ = 324240.

The previous prime is 664253. The next prime is 664271. The reversal of 664264 is 462466.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622 + ... + 1309.

It is an arithmetic number, because the mean of its divisors is an integer number (79695).

2⁶⁶⁴²⁶⁴ is an apocalyptic number.

It is an amenable number.

664264 is a deficient number, since it is larger than the sum of its proper divisors (610856).

664264 is a wasteful number, since it uses less digits than its factorization.

664264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980 (or 1976 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 664264 is about 815.0239260292. The cubic root of 664264 is about 87.2529740121.

Adding to 664264 its product of digits (6912), we get a palindrome (671176).

It can be divided in two parts, 66426 and 4, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 664264 in words is "six hundred sixty-four thousand, two hundred sixty-four".