628031 has 4 divisors (see below), whose sum is σ = 664992. Its totient is φ = 591072.

The previous prime is 628021. The next prime is 628037. The reversal of 628031 is 130826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130826 = 2 ⋅65413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628031 is a prime.

It is a super-2 number, since 2×628031² = 788845873922, 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 = 627994 and 628012.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 628031.

It is not an unprimeable number, because it can be changed into a prime (628037) 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, 18455 + ... + 18488.

It is an arithmetic number, because the mean of its divisors is an integer number (166248).

2⁶²⁸⁰³¹ is an apocalyptic number.

628031 is a deficient number, since it is larger than the sum of its proper divisors (36961).

628031 is a wasteful number, since it uses less digits than its factorization.

628031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36960.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 628031 is about 792.4840692405. The cubic root of 628031 is about 85.6367861660.

Adding to 628031 its reverse (130826), we get a palindrome (758857).

The spelling of 628031 in words is "six hundred twenty-eight thousand, thirty-one".