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628321 = 1016221
BaseRepresentation
bin10011001011001100001
31011220220011
42121121201
5130101241
621244521
75224561
oct2313141
91156804
10628321
1139a081
12263741
1318ccb5
14124da1
15c6281
hex99661

628321 has 4 divisors (see below), whose sum is σ = 634644. Its totient is φ = 622000.

The previous prime is 628319. The next prime is 628357. The reversal of 628321 is 123826.

628321 = 5602 + 5612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 314721 = 560^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 628321 - 21 = 628319 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 628292 and 628301.

It is not an unprimeable number, because it can be changed into a prime (628301) 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, 3010 + ... + 3211.

It is an arithmetic number, because the mean of its divisors is an integer number (158661).

2628321 is an apocalyptic number.

628321 is the 561-st centered square number.

It is an amenable number.

628321 is a deficient number, since it is larger than the sum of its proper divisors (6323).

628321 is a wasteful number, since it uses less digits than its factorization.

628321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322.

The product of its digits is 576, while the sum is 22.

The square root of 628321 is about 792.6670171011. The cubic root of 628321 is about 85.6499653702.

It can be divided in two parts, 628 and 321, that added together give a palindrome (949).

The spelling of 628321 in words is "six hundred twenty-eight thousand, three hundred twenty-one".

Divisors: 1 101 6221 628321