2788464221 has 2 divisors, whose sum is σ = 2788464222. Its totient is φ = 2788464220.

The previous prime is 2788464209. The next prime is 2788464311. The reversal of 2788464221 is 1224648872.

2788464221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2663695321 + 124768900 = 51611^2 + 11170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2788464221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2788463221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394232110 + 1394232111.

It is an arithmetic number, because the mean of its divisors is an integer number (1394232111).

Almost surely, 2^2788464221 is an apocalyptic number.

It is an amenable number.

2788464221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2788464221 is an equidigital number, since it uses as much as digits as its factorization.

2788464221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 344064, while the sum is 44.

The square root of 2788464221 is about 52805.9108528581. The cubic root of 2788464221 is about 1407.5214611406.

The spelling of 2788464221 in words is "two billion, seven hundred eighty-eight million, four hundred sixty-four thousand, two hundred twenty-one".