2788321 has 4 divisors (see below), whose sum is σ = 2884500. Its totient is φ = 2692144.

The previous prime is 2788309. The next prime is 2788327. The reversal of 2788321 is 1238872.

2788321 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2359296 + 429025 = 1536^2 + 655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2788321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2788327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48046 + ... + 48103.

It is an arithmetic number, because the mean of its divisors is an integer number (721125).

2^2788321 is an apocalyptic number.

It is an amenable number.

2788321 is a deficient number, since it is larger than the sum of its proper divisors (96179).

2788321 is an equidigital number, since it uses as much as digits as its factorization.

2788321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96178.

The product of its digits is 5376, while the sum is 31.

The square root of 2788321 is about 1669.8266377082. The cubic root of 2788321 is about 140.7497363039.

The spelling of 2788321 in words is "two million, seven hundred eighty-eight thousand, three hundred twenty-one".