673659 has 36 divisors (see below), whose sum is σ = 1213264. Its totient is φ = 352512.

The previous prime is 673649. The next prime is 673667. The reversal of 673659 is 956376.

It is a happy number.

It is not a de Polignac number, because 673659 - 2⁴ = 673643 is a prime.

It is a Duffinian number.

Its product of digits (34020) is a multiple of the sum of its prime factors (84).

673659 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 673659.

It is not an unprimeable number, because it can be changed into a prime (673609) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18189 + ... + 18225.

2⁶⁷³⁶⁵⁹ is an apocalyptic number.

673659 is a deficient number, since it is larger than the sum of its proper divisors (539605).

673659 is a wasteful number, since it uses less digits than its factorization.

673659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 64 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 673659 is about 820.7673239110. The cubic root of 673659 is about 87.6624031493.

The spelling of 673659 in words is "six hundred seventy-three thousand, six hundred fifty-nine".