2805378321 has 4 divisors (see below), whose sum is σ = 3740504432. Its totient is φ = 1870252212.

The previous prime is 2805378293. The next prime is 2805378409. The reversal of 2805378321 is 1238735082.

2805378321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2805378321 - 2¹⁵ = 2805345553 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 2805378321.

It is not an unprimeable number, because it can be changed into a prime (2805373321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467563051 + ... + 467563056.

It is an arithmetic number, because the mean of its divisors is an integer number (935126108).

Almost surely, 2^2805378321 is an apocalyptic number.

It is an amenable number.

2805378321 is a deficient number, since it is larger than the sum of its proper divisors (935126111).

2805378321 is an equidigital number, since it uses as much as digits as its factorization.

2805378321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935126110.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 2805378321 is about 52965.8221969602. The cubic root of 2805378321 is about 1410.3616129003.

The spelling of 2805378321 in words is "two billion, eight hundred five million, three hundred seventy-eight thousand, three hundred twenty-one".