2685236638 has 32 divisors (see below), whose sum is σ = 4640716800. Its totient is φ = 1141486944.

The previous prime is 2685236629. The next prime is 2685236641. The reversal of 2685236638 is 8366325862.

It is a junction number, because it is equal to n+sod(n) for n = 2685236591 and 2685236600.

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, 1199256 + ... + 1201492.

It is an arithmetic number, because the mean of its divisors is an integer number (145022400).

Almost surely, 2^2685236638 is an apocalyptic number.

2685236638 is a deficient number, since it is larger than the sum of its proper divisors (1955480162).

2685236638 is a wasteful number, since it uses less digits than its factorization.

2685236638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904.

The product of its digits is 2488320, while the sum is 49.

The square root of 2685236638 is about 51819.2689836512. The cubic root of 2685236638 is about 1389.9340303042.

The spelling of 2685236638 in words is "two billion, six hundred eighty-five million, two hundred thirty-six thousand, six hundred thirty-eight".