2806638821 has 8 divisors (see below), whose sum is σ = 3318193920. Its totient is φ = 2322735408.

The previous prime is 2806638781. The next prime is 2806638823. The reversal of 2806638821 is 1288366082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2806638821 - 2²² = 2802444517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2806638823) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6912701 + ... + 6913106.

It is an arithmetic number, because the mean of its divisors is an integer number (414774240).

Almost surely, 2^2806638821 is an apocalyptic number.

It is an amenable number.

2806638821 is a deficient number, since it is larger than the sum of its proper divisors (511555099).

2806638821 is a wasteful number, since it uses less digits than its factorization.

2806638821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13825843.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 2806638821 is about 52977.7200434296. The cubic root of 2806638821 is about 1410.5728137222.

The spelling of 2806638821 in words is "two billion, eight hundred six million, six hundred thirty-eight thousand, eight hundred twenty-one".