628317 has 10 divisors (see below), whose sum is σ = 938718. Its totient is φ = 418824.

The previous prime is 628301. The next prime is 628319. The reversal of 628317 is 713826.

628317 is a `hidden beast` number, since 628 + 31 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 599076 + 29241 = 774^2 + 171^2 .

It is not a de Polignac number, because 628317 - 2⁴ = 628301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 628317.

It is not an unprimeable number, because it can be changed into a prime (628319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3798 + ... + 3959.

2⁶²⁸³¹⁷ is an apocalyptic number.

It is an amenable number.

628317 is a deficient number, since it is larger than the sum of its proper divisors (310401).

628317 is an equidigital number, since it uses as much as digits as its factorization.

628317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7769 (or 7760 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 628317 is about 792.6644939695. The cubic root of 628317 is about 85.6497836156.

The spelling of 628317 in words is "six hundred twenty-eight thousand, three hundred seventeen".