628605 has 24 divisors (see below), whose sum is σ = 1112280. Its totient is φ = 328320.

The previous prime is 628591. The next prime is 628651. The reversal of 628605 is 506826.

It can be written as a sum of positive squares in 4 ways, for example, as 47961 + 580644 = 219^2 + 762^2 .

It is not a de Polignac number, because 628605 - 2⁷ = 628477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2631 + ... + 2859.

It is an arithmetic number, because the mean of its divisors is an integer number (46345).

2⁶²⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

628605 is a deficient number, since it is larger than the sum of its proper divisors (483675).

628605 is a wasteful number, since it uses less digits than its factorization.

628605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 628605 is about 792.8461389198. The cubic root of 628605 is about 85.6628679715.

The spelling of 628605 in words is "six hundred twenty-eight thousand, six hundred five".