664275 has 24 divisors (see below), whose sum is σ = 1165104. Its totient is φ = 332800.

The previous prime is 664273. The next prime is 664289. The reversal of 664275 is 572466.

It is not a de Polignac number, because 664275 - 2¹ = 664273 is a prime.

It is a super-2 number, since 2×664275² = 882522551250, which contains 22 as substring.

664275 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (664271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015 + ... + 1535.

It is an arithmetic number, because the mean of its divisors is an integer number (48546).

2⁶⁶⁴²⁷⁵ is an apocalyptic number.

664275 is a deficient number, since it is larger than the sum of its proper divisors (500829).

664275 is a wasteful number, since it uses less digits than its factorization.

664275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 546 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 664275 is about 815.0306742694. The cubic root of 664275 is about 87.2534556366.

Subtracting from 664275 its reverse (572466), we obtain a square (91809 = 303²).

It can be divided in two parts, 664 and 275, that added together give a palindrome (939).

The spelling of 664275 in words is "six hundred sixty-four thousand, two hundred seventy-five".