628974685 has 4 divisors (see below), whose sum is σ = 754769628. Its totient is φ = 503179744.

The previous prime is 628974679. The next prime is 628974701. The reversal of 628974685 is 586479826.

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 74183769 + 554790916 = 8613^2 + 23554^2 .

It is a cyclic number.

It is not a de Polignac number, because 628974685 - 2⁷ = 628974557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62897464 + ... + 62897473.

It is an arithmetic number, because the mean of its divisors is an integer number (188692407).

Almost surely, 2^628974685 is an apocalyptic number.

It is an amenable number.

628974685 is a deficient number, since it is larger than the sum of its proper divisors (125794943).

628974685 is a wasteful number, since it uses less digits than its factorization.

628974685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125794942.

The product of its digits is 5806080, while the sum is 55.

The square root of 628974685 is about 25079.3677153153. The cubic root of 628974685 is about 856.7965756718.

The spelling of 628974685 in words is "six hundred twenty-eight million, nine hundred seventy-four thousand, six hundred eighty-five".