673428409 has 2 divisors, whose sum is σ = 673428410. Its totient is φ = 673428408.

The previous prime is 673428391. The next prime is 673428439. The reversal of 673428409 is 904824376.

673428409 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., 660490000 + 12938409 = 25700^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 673428409 - 2⁵ = 673428377 is a prime.

It is not a weakly prime, because it can be changed into another prime (673428439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336714204 + 336714205.

It is an arithmetic number, because the mean of its divisors is an integer number (336714205).

Almost surely, 2^673428409 is an apocalyptic number.

It is an amenable number.

673428409 is a deficient number, since it is larger than the sum of its proper divisors (1).

673428409 is an equidigital number, since it uses as much as digits as its factorization.

673428409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 673428409 is about 25950.4992052176. The cubic root of 673428409 is about 876.5239983506.

The spelling of 673428409 in words is "six hundred seventy-three million, four hundred twenty-eight thousand, four hundred nine".