670728533 has 2 divisors, whose sum is σ = 670728534. Its totient is φ = 670728532.

The previous prime is 670728521. The next prime is 670728581. The reversal of 670728533 is 335827076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396726724 + 274001809 = 19918^2 + 16553^2 .

It is a cyclic number.

It is not a de Polignac number, because 670728533 - 2⁴ = 670728517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670724533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335364266 + 335364267.

It is an arithmetic number, because the mean of its divisors is an integer number (335364267).

Almost surely, 2^670728533 is an apocalyptic number.

It is an amenable number.

670728533 is a deficient number, since it is larger than the sum of its proper divisors (1).

670728533 is an equidigital number, since it uses as much as digits as its factorization.

670728533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 670728533 is about 25898.4272302393. The cubic root of 670728533 is about 875.3510571750.

The spelling of 670728533 in words is "six hundred seventy million, seven hundred twenty-eight thousand, five hundred thirty-three".