684870445 has 32 divisors (see below), whose sum is σ = 972988416. Its totient is φ = 452865600.

The previous prime is 684870443. The next prime is 684870457. The reversal of 684870445 is 544078486.

It is not a de Polignac number, because 684870445 - 2¹ = 684870443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684870395 and 684870404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684870443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358182 + ... + 360088.

It is an arithmetic number, because the mean of its divisors is an integer number (30405888).

Almost surely, 2^684870445 is an apocalyptic number.

It is an amenable number.

684870445 is a deficient number, since it is larger than the sum of its proper divisors (288117971).

684870445 is a wasteful number, since it uses less digits than its factorization.

684870445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281.

The product of its (nonzero) digits is 860160, while the sum is 46.

The square root of 684870445 is about 26170.0295185160. The cubic root of 684870445 is about 881.4604043319.

The spelling of 684870445 in words is "six hundred eighty-four million, eight hundred seventy thousand, four hundred forty-five".