628709 has 2 divisors, whose sum is σ = 628710. Its totient is φ = 628708.

The previous prime is 628699. The next prime is 628721. The reversal of 628709 is 907826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 124609 = 710^2 + 353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628709 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 628709.

It is not a weakly prime, because it can be changed into another prime (628759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314354 + 314355.

It is an arithmetic number, because the mean of its divisors is an integer number (314355).

2⁶²⁸⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

628709 is a deficient number, since it is larger than the sum of its proper divisors (1).

628709 is an equidigital number, since it uses as much as digits as its factorization.

628709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 628709 is about 792.9117227031. The cubic root of 628709 is about 85.6675918957.

The spelling of 628709 in words is "six hundred twenty-eight thousand, seven hundred nine".