670784509 has 2 divisors, whose sum is σ = 670784510. Its totient is φ = 670784508.

The previous prime is 670784501. The next prime is 670784519. The reversal of 670784509 is 905487076.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605012409 + 65772100 = 24597^2 + 8110^2 .

It is a cyclic number.

It is not a de Polignac number, because 670784509 - 2³ = 670784501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670784501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335392254 + 335392255.

It is an arithmetic number, because the mean of its divisors is an integer number (335392255).

Almost surely, 2^670784509 is an apocalyptic number.

It is an amenable number.

670784509 is a deficient number, since it is larger than the sum of its proper divisors (1).

670784509 is an equidigital number, since it uses as much as digits as its factorization.

670784509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 670784509 is about 25899.5078910778. The cubic root of 670784509 is about 875.3754074575.

The spelling of 670784509 in words is "six hundred seventy million, seven hundred eighty-four thousand, five hundred nine".