628169 has 4 divisors (see below), whose sum is σ = 649860. Its totient is φ = 606480.

The previous prime is 628139. The next prime is 628171. The reversal of 628169 is 961826.

628169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 262144 + 366025 = 512^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 628169 - 2¹⁶ = 562633 is a prime.

It is a super-2 number, since 2×628169² = 789192585122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10802 + ... + 10859.

It is an arithmetic number, because the mean of its divisors is an integer number (162465).

2⁶²⁸¹⁶⁹ is an apocalyptic number.

It is an amenable number.

628169 is a deficient number, since it is larger than the sum of its proper divisors (21691).

628169 is a wasteful number, since it uses less digits than its factorization.

628169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21690.

The product of its digits is 5184, while the sum is 32.

The square root of 628169 is about 792.5711324544. The cubic root of 628169 is about 85.6430581552.

It can be divided in two parts, 628 and 169, that added together give a palindrome (797).

The spelling of 628169 in words is "six hundred twenty-eight thousand, one hundred sixty-nine".