2808409993 has 8 divisors (see below), whose sum is σ = 2815838856. Its totient is φ = 2800992000.

The previous prime is 2808409973. The next prime is 2808410021. The reversal of 2808409993 is 3999048082.

It can be written as a sum of positive squares in 4 ways, for example, as 30382144 + 2778027849 = 5512^2 + 52707^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2808409993 - 2¹³ = 2808401801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2808409993.

It is not an unprimeable number, because it can be changed into a prime (2808409913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782463 + ... + 786043.

It is an arithmetic number, because the mean of its divisors is an integer number (351979857).

Almost surely, 2^2808409993 is an apocalyptic number.

It is an amenable number.

2808409993 is a deficient number, since it is larger than the sum of its proper divisors (7428863).

2808409993 is a wasteful number, since it uses less digits than its factorization.

2808409993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5435.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 2808409993 is about 52994.4336039173. The cubic root of 2808409993 is about 1410.8694724506.

The spelling of 2808409993 in words is "two billion, eight hundred eight million, four hundred nine thousand, nine hundred ninety-three".