628585 has 4 divisors (see below), whose sum is σ = 754308. Its totient is φ = 502864.

The previous prime is 628583. The next prime is 628591. The reversal of 628585 is 585826.

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 301401 + 327184 = 549^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 628585 - 2¹ = 628583 is a prime.

It is a Duffinian number.

628585 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 628585.

It is not an unprimeable number, because it can be changed into a prime (628583) 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 3 ways as a sum of consecutive naturals, for example, 62854 + ... + 62863.

It is an arithmetic number, because the mean of its divisors is an integer number (188577).

2⁶²⁸⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

628585 is a deficient number, since it is larger than the sum of its proper divisors (125723).

628585 is a wasteful number, since it uses less digits than its factorization.

628585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125722.

The product of its digits is 19200, while the sum is 34.

The square root of 628585 is about 792.8335260318. The cubic root of 628585 is about 85.6619594649.

The spelling of 628585 in words is "six hundred twenty-eight thousand, five hundred eighty-five".