628345 has 4 divisors (see below), whose sum is σ = 754020. Its totient is φ = 502672.

The previous prime is 628319. The next prime is 628357. The reversal of 628345 is 543826.

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 318096 + 310249 = 564^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 628345 - 2⁷ = 628217 is a prime.

It is an unprimeable number.

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, 62830 + ... + 62839.

It is an arithmetic number, because the mean of its divisors is an integer number (188505).

2⁶²⁸³⁴⁵ is an apocalyptic number.

It is an amenable number.

628345 is a deficient number, since it is larger than the sum of its proper divisors (125675).

628345 is a wasteful number, since it uses less digits than its factorization.

628345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125674.

The product of its digits is 5760, while the sum is 28.

The square root of 628345 is about 792.6821557220. The cubic root of 628345 is about 85.6510558812.

It can be divided in two parts, 6283 and 45, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 628345 in words is "six hundred twenty-eight thousand, three hundred forty-five".