628505685 has 12 divisors (see below), whose sum is σ = 1089409932. Its totient is φ = 335203008.

The previous prime is 628505677. The next prime is 628505699. The reversal of 628505685 is 586505826.

628505685 is a `hidden beast` number, since 6 + 2 + 85 + 0 + 568 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 200760561 + 427745124 = 14169^2 + 20682^2 .

It is not a de Polignac number, because 628505685 - 2³ = 628505677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 13966793 = 628505685 / (6 + 2 + 8 + 5 + 0 + 5 + 6 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 628505685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6983352 + ... + 6983441.

It is an arithmetic number, because the mean of its divisors is an integer number (90784161).

Almost surely, 2^628505685 is an apocalyptic number.

It is an amenable number.

628505685 is a deficient number, since it is larger than the sum of its proper divisors (460904247).

628505685 is a wasteful number, since it uses less digits than its factorization.

628505685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13966804 (or 13966801 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The square root of 628505685 is about 25070.0156561579. The cubic root of 628505685 is about 856.5835636472.

The spelling of 628505685 in words is "six hundred twenty-eight million, five hundred five thousand, six hundred eighty-five".