628218 has 24 divisors (see below), whose sum is σ = 1441908. Its totient is φ = 196992.

The previous prime is 628217. The next prime is 628219. The reversal of 628218 is 812826.

It is an interprime number because it is at equal distance from previous prime (628217) and next prime (628219).

It can be written as a sum of positive squares in 2 ways, for example, as 613089 + 15129 = 783^2 + 123^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 628191 and 628200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 721 + ... + 1332.

2⁶²⁸²¹⁸ is an apocalyptic number.

628218 is an abundant number, since it is smaller than the sum of its proper divisors (813690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628218 is a wasteful number, since it uses less digits than its factorization.

628218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 2075 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 628218 is about 792.6020439035. The cubic root of 628218 is about 85.6452849449.

It can be divided in two parts, 6 and 28218, that added together give a square (28224 = 168²).

The spelling of 628218 in words is "six hundred twenty-eight thousand, two hundred eighteen".