2804568721 has 4 divisors (see below), whose sum is σ = 2813704432. Its totient is φ = 2795433012.

The previous prime is 2804568713. The next prime is 2804568731. The reversal of 2804568721 is 1278654082.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2804568721 - 2³ = 2804568713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2804568731) 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, 4567395 + ... + 4568008.

It is an arithmetic number, because the mean of its divisors is an integer number (703426108).

Almost surely, 2^2804568721 is an apocalyptic number.

It is an amenable number.

2804568721 is a deficient number, since it is larger than the sum of its proper divisors (9135711).

2804568721 is an equidigital number, since it uses as much as digits as its factorization.

2804568721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9135710.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 2804568721 is about 52958.1789811546. The cubic root of 2804568721 is about 1410.2259284533.

The spelling of 2804568721 in words is "two billion, eight hundred four million, five hundred sixty-eight thousand, seven hundred twenty-one".