628021 has 2 divisors, whose sum is σ = 628022. Its totient is φ = 628020.

The previous prime is 628013. The next prime is 628037. The reversal of 628021 is 120826.

It is a happy number.

628021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 122500 = 711^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 628021 - 2³ = 628013 is a prime.

628021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 628021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314010 + 314011.

It is an arithmetic number, because the mean of its divisors is an integer number (314011).

2⁶²⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

628021 is a deficient number, since it is larger than the sum of its proper divisors (1).

628021 is an equidigital number, since it uses as much as digits as its factorization.

628021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 628021 is about 792.4777599403. The cubic root of 628021 is about 85.6363316383.

Adding to 628021 its reverse (120826), we get a palindrome (748847).

The spelling of 628021 in words is "six hundred twenty-eight thousand, twenty-one".