668473 has 4 divisors (see below), whose sum is σ = 719908. Its totient is φ = 617040.

The previous prime is 668471. The next prime is 668509. The reversal of 668473 is 374866.

668473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 374866 = 2 ⋅187433.

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 426409 = 492^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 668473 - 2¹ = 668471 is a prime.

It is a Duffinian number.

668473 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (668471) 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, 25698 + ... + 25723.

It is an arithmetic number, because the mean of its divisors is an integer number (179977).

2⁶⁶⁸⁴⁷³ is an apocalyptic number.

It is an amenable number.

668473 is a deficient number, since it is larger than the sum of its proper divisors (51435).

668473 is a wasteful number, since it uses less digits than its factorization.

668473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51434.

The product of its digits is 24192, while the sum is 34.

The square root of 668473 is about 817.6019814066. The cubic root of 668473 is about 87.4368741975.

The spelling of 668473 in words is "six hundred sixty-eight thousand, four hundred seventy-three".