673649 has 2 divisors, whose sum is σ = 673650. Its totient is φ = 673648.

The previous prime is 673643. The next prime is 673667. The reversal of 673649 is 946376.

673649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 283024 = 625^2 + 532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673649 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 673649.

It is not a weakly prime, because it can be changed into another prime (673643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336824 + 336825.

It is an arithmetic number, because the mean of its divisors is an integer number (336825).

2⁶⁷³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

673649 is a deficient number, since it is larger than the sum of its proper divisors (1).

673649 is an equidigital number, since it uses as much as digits as its factorization.

673649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 673649 is about 820.7612320279. The cubic root of 673649 is about 87.6619693847.

The spelling of 673649 in words is "six hundred seventy-three thousand, six hundred forty-nine".