628331 has 6 divisors (see below), whose sum is σ = 688332. Its totient is φ = 568820.

The previous prime is 628319. The next prime is 628357. The reversal of 628331 is 133826.

It is not a de Polignac number, because 628331 - 2⁶ = 628267 is a prime.

It is a super-2 number, since 2×628331² = 789599691122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628297 and 628306.

It is not an unprimeable number, because it can be changed into a prime (628301) 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 5 ways as a sum of consecutive naturals, for example, 2510 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (114722).

2⁶²⁸³³¹ is an apocalyptic number.

628331 is a deficient number, since it is larger than the sum of its proper divisors (60001).

628331 is an equidigital number, since it uses as much as digits as its factorization.

628331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 250 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 628331 is about 792.6733248949. The cubic root of 628331 is about 85.6504197531.

It can be divided in two parts, 628 and 331, that added together give a palindrome (959).

The spelling of 628331 in words is "six hundred twenty-eight thousand, three hundred thirty-one".