628705 has 32 divisors (see below), whose sum is σ = 995328. Its totient is φ = 369600.

The previous prime is 628699. The next prime is 628709. The reversal of 628705 is 507826.

It is not a de Polignac number, because 628705 - 2⁵ = 628673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628709) 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 31 ways as a sum of consecutive naturals, for example, 8820 + ... + 8890.

It is an arithmetic number, because the mean of its divisors is an integer number (31104).

2⁶²⁸⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

628705 is a deficient number, since it is larger than the sum of its proper divisors (366623).

628705 is a wasteful number, since it uses less digits than its factorization.

628705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 628705 is about 792.9092003502. The cubic root of 628705 is about 85.6674102159.

The spelling of 628705 in words is "six hundred twenty-eight thousand, seven hundred five".