2821680645 has 16 divisors (see below), whose sum is σ = 5159644800. Its totient is φ = 1289911104.

The previous prime is 2821680637. The next prime is 2821680661. The reversal of 2821680645 is 5460861282.

It is not a de Polignac number, because 2821680645 - 2³ = 2821680637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2821680597 and 2821680606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13436470 + ... + 13436679.

It is an arithmetic number, because the mean of its divisors is an integer number (322477800).

Almost surely, 2^2821680645 is an apocalyptic number.

It is an amenable number.

2821680645 is a deficient number, since it is larger than the sum of its proper divisors (2337964155).

2821680645 is a wasteful number, since it uses less digits than its factorization.

2821680645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26873164.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 2821680645 is about 53119.4940205571. The cubic root of 2821680645 is about 1413.0882538967.

The spelling of 2821680645 in words is "two billion, eight hundred twenty-one million, six hundred eighty thousand, six hundred forty-five".