664273 has 2 divisors, whose sum is σ = 664274. Its totient is φ = 664272.

The previous prime is 664271. The next prime is 664289. The reversal of 664273 is 372466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543169 + 121104 = 737^2 + 348^2 .

It is a cyclic number.

It is not a de Polignac number, because 664273 - 2¹ = 664271 is a prime.

Together with 664271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (664271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332136 + 332137.

It is an arithmetic number, because the mean of its divisors is an integer number (332137).

2⁶⁶⁴²⁷³ is an apocalyptic number.

It is an amenable number.

664273 is a deficient number, since it is larger than the sum of its proper divisors (1).

664273 is an equidigital number, since it uses as much as digits as its factorization.

664273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 664273 is about 815.0294473208. The cubic root of 664273 is about 87.2533680689.

It can be divided in two parts, 66427 and 3, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 664273 in words is "six hundred sixty-four thousand, two hundred seventy-three".