673668 has 18 divisors (see below), whose sum is σ = 1702974. Its totient is φ = 224544.

The previous prime is 673667. The next prime is 673669. The reversal of 673668 is 866376.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (673667) and next prime (673669).

It can be written as a sum of positive squares in only one way, i.e., 636804 + 36864 = 798^2 + 192^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18713 = 673668 / (6 + 7 + 3 + 6 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (673667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9321 + ... + 9392.

2⁶⁷³⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

673668 is an abundant number, since it is smaller than the sum of its proper divisors (1029306).

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

673668 is a wasteful number, since it uses less digits than its factorization.

673668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18723 (or 18718 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 673668 is about 820.7728065671. The cubic root of 673668 is about 87.6627935338.

The spelling of 673668 in words is "six hundred seventy-three thousand, six hundred sixty-eight".