668534 has 16 divisors (see below), whose sum is σ = 1074480. Its totient is φ = 311040.

The previous prime is 668533. The next prime is 668539. The reversal of 668534 is 435866.

It is a self number, because there is not a number n which added to its sum of digits gives 668534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2654 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (67155).

2⁶⁶⁸⁵³⁴ is an apocalyptic number.

668534 is a deficient number, since it is larger than the sum of its proper divisors (405946).

668534 is a wasteful number, since it uses less digits than its factorization.

668534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335.

The product of its digits is 17280, while the sum is 32.

The square root of 668534 is about 817.6392847705. The cubic root of 668534 is about 87.4395337350.

The spelling of 668534 in words is "six hundred sixty-eight thousand, five hundred thirty-four".