628281 has 6 divisors (see below), whose sum is σ = 907530. Its totient is φ = 418848.

The previous prime is 628267. The next prime is 628289. The reversal of 628281 is 182826.

628281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 19881 = 780^2 + 141^2 .

It is not a de Polignac number, because 628281 - 2⁶ = 628217 is a prime.

It is a super-2 number, since 2×628281² = 789474029922, which contains 22 as substring.

628281 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 628281.

It is not an unprimeable number, because it can be changed into a prime (628289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34896 + ... + 34913.

It is an arithmetic number, because the mean of its divisors is an integer number (151255).

2⁶²⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

628281 is a deficient number, since it is larger than the sum of its proper divisors (279249).

628281 is a wasteful number, since it uses less digits than its factorization.

628281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69815 (or 69812 counting only the distinct ones).

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

The square root of 628281 is about 792.6417854239. The cubic root of 628281 is about 85.6481477900.

It can be divided in two parts, 628 and 281, that added together give a palindrome (909).

The spelling of 628281 in words is "six hundred twenty-eight thousand, two hundred eighty-one".