628220 has 24 divisors (see below), whose sum is σ = 1336608. Its totient is φ = 248000.

The previous prime is 628219. The next prime is 628231. The reversal of 628220 is 22826.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 628192 and 628201.

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 628220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1865 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (55692).

2⁶²⁸²²⁰ is an apocalyptic number.

It is an amenable number.

628220 is an abundant number, since it is smaller than the sum of its proper divisors (708388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628220 is a wasteful number, since it uses less digits than its factorization.

628220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 628220 is about 792.6033055697. The cubic root of 628220 is about 85.6453758318.

It can be divided in two parts, 628 and 220, that added together give a palindrome (848).

The spelling of 628220 in words is "six hundred twenty-eight thousand, two hundred twenty".