670689 has 6 divisors (see below), whose sum is σ = 968786. Its totient is φ = 447120.

The previous prime is 670673. The next prime is 670693. The reversal of 670689 is 986076.

It can be written as a sum of positive squares in only one way, i.e., 613089 + 57600 = 783^2 + 240^2 .

It is not a de Polignac number, because 670689 - 2⁴ = 670673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37252 + ... + 37269.

2⁶⁷⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

670689 is a deficient number, since it is larger than the sum of its proper divisors (298097).

670689 is a wasteful number, since it uses less digits than its factorization.

670689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74527 (or 74524 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 670689 is about 818.9560427764. The cubic root of 670689 is about 87.5333858993.

The spelling of 670689 in words is "six hundred seventy thousand, six hundred eighty-nine".