668512 has 24 divisors (see below), whose sum is σ = 1418256. Its totient is φ = 308352.

The previous prime is 668509. The next prime is 668513. The reversal of 668512 is 215866.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668513) 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, 388 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (59094).

2⁶⁶⁸⁵¹² is an apocalyptic number.

It is an amenable number.

668512 is an abundant number, since it is smaller than the sum of its proper divisors (749744).

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

668512 is a wasteful number, since it uses less digits than its factorization.

668512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 1622 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 668512 is about 817.6258312945. The cubic root of 668512 is about 87.4385745762.

The spelling of 668512 in words is "six hundred sixty-eight thousand, five hundred twelve".