670351729 has 2 divisors, whose sum is σ = 670351730. Its totient is φ = 670351728.

The previous prime is 670351723. The next prime is 670351751. The reversal of 670351729 is 927153076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637461504 + 32890225 = 25248^2 + 5735^2 .

It is a cyclic number.

It is not a de Polignac number, because 670351729 - 2⁷ = 670351601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 670351691 and 670351700.

It is not a weakly prime, because it can be changed into another prime (670351723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335175864 + 335175865.

It is an arithmetic number, because the mean of its divisors is an integer number (335175865).

Almost surely, 2^670351729 is an apocalyptic number.

It is an amenable number.

670351729 is a deficient number, since it is larger than the sum of its proper divisors (1).

670351729 is an equidigital number, since it uses as much as digits as its factorization.

670351729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 670351729 is about 25891.1515580130. The cubic root of 670351729 is about 875.1871073064.

The spelling of 670351729 in words is "six hundred seventy million, three hundred fifty-one thousand, seven hundred twenty-nine".