668480 has 28 divisors (see below), whose sum is σ = 1592580. Its totient is φ = 267264.

The previous prime is 668471. The next prime is 668509. The reversal of 668480 is 84866.

It can be written as a sum of positive squares in 2 ways, for example, as 430336 + 238144 = 656^2 + 488^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725 + ... + 1364.

2⁶⁶⁸⁴⁸⁰ is an apocalyptic number.

It is an amenable number.

668480 is an abundant number, since it is smaller than the sum of its proper divisors (924100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668480 is a wasteful number, since it uses less digits than its factorization.

668480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106 (or 2096 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 668480 is about 817.6062622069. The cubic root of 668480 is about 87.4371793986.

It can be divided in two parts, 6 and 68480, that added together give a palindrome (68486).

The spelling of 668480 in words is "six hundred sixty-eight thousand, four hundred eighty".