664277 has 4 divisors (see below), whose sum is σ = 670956. Its totient is φ = 657600.

The previous prime is 664273. The next prime is 664289. The reversal of 664277 is 772466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 772466 = 2 ⋅386233.

It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 14641 = 806^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 664277 - 2² = 664273 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 (664271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3188 + ... + 3389.

It is an arithmetic number, because the mean of its divisors is an integer number (167739).

2⁶⁶⁴²⁷⁷ is an apocalyptic number.

It is an amenable number.

664277 is a deficient number, since it is larger than the sum of its proper divisors (6679).

664277 is a wasteful number, since it uses less digits than its factorization.

664277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678.

The product of its digits is 14112, while the sum is 32.

The square root of 664277 is about 815.0319012161. The cubic root of 664277 is about 87.2535432041.

It can be divided in two parts, 66 and 4277, that multiplied together give a palindrome (282282).

The spelling of 664277 in words is "six hundred sixty-four thousand, two hundred seventy-seven".