673640 has 32 divisors (see below), whose sum is σ = 1654560. Its totient is φ = 244800.

The previous prime is 673639. The next prime is 673643. The reversal of 673640 is 46376.

It is not an unprimeable number, because it can be changed into a prime (673643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (51705).

2⁶⁷³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

673640 is an abundant number, since it is smaller than the sum of its proper divisors (980920).

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

673640 is a wasteful number, since it uses less digits than its factorization.

673640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 673640 is about 820.7557492945. The cubic root of 673640 is about 87.6615789928.

Subtracting from 673640 its reverse (46376), we obtain a square (627264 = 792²).

It can be divided in two parts, 6736 and 40, that added together give a palindrome (6776).

The spelling of 673640 in words is "six hundred seventy-three thousand, six hundred forty".