628217 has 2 divisors, whose sum is σ = 628218. Its totient is φ = 628216.

The previous prime is 628213. The next prime is 628219. The reversal of 628217 is 712826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 44521 = 764^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 628217 - 2² = 628213 is a prime.

Together with 628219, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 9.

It is not a weakly prime, because it can be changed into another prime (628213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314108 + 314109.

It is an arithmetic number, because the mean of its divisors is an integer number (314109).

2⁶²⁸²¹⁷ is an apocalyptic number.

It is an amenable number.

628217 is a deficient number, since it is larger than the sum of its proper divisors (1).

628217 is an equidigital number, since it uses as much as digits as its factorization.

628217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 628217 is about 792.6014130696. The cubic root of 628217 is about 85.6452395013.

The spelling of 628217 in words is "six hundred twenty-eight thousand, two hundred seventeen".