670729 has 2 divisors, whose sum is σ = 670730. Its totient is φ = 670728.

The previous prime is 670727. The next prime is 670739. The reversal of 670729 is 927076.

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., 366025 + 304704 = 605^2 + 552^2 .

It is a cyclic number.

It is not a de Polignac number, because 670729 - 2¹ = 670727 is a prime.

Together with 670727, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

670729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 670729.

It is not a weakly prime, because it can be changed into another prime (670727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335364 + 335365.

It is an arithmetic number, because the mean of its divisors is an integer number (335365).

2⁶⁷⁰⁷²⁹ is an apocalyptic number.

It is an amenable number.

670729 is a deficient number, since it is larger than the sum of its proper divisors (1).

670729 is an equidigital number, since it uses as much as digits as its factorization.

670729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 670729 is about 818.9804637475. The cubic root of 670729 is about 87.5351260332.

It can be divided in two parts, 67072 and 9, that added together give a square (67081 = 259²).

The spelling of 670729 in words is "six hundred seventy thousand, seven hundred twenty-nine".