2788631345 has 4 divisors (see below), whose sum is σ = 3346357620. Its totient is φ = 2230905072.

The previous prime is 2788631341. The next prime is 2788631353. The reversal of 2788631345 is 5431368872.

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 1801917601 + 986713744 = 42449^2 + 31412^2 .

It is a cyclic number.

It is not a de Polignac number, because 2788631345 - 2² = 2788631341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2788631345.

It is not an unprimeable number, because it can be changed into a prime (2788631341) 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, 278863130 + ... + 278863139.

It is an arithmetic number, because the mean of its divisors is an integer number (836589405).

Almost surely, 2^2788631345 is an apocalyptic number.

It is an amenable number.

2788631345 is a deficient number, since it is larger than the sum of its proper divisors (557726275).

2788631345 is an equidigital number, since it uses as much as digits as its factorization.

2788631345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557726274.

The product of its digits is 967680, while the sum is 47.

The square root of 2788631345 is about 52807.4932656342. The cubic root of 2788631345 is about 1407.5495800738.

The spelling of 2788631345 in words is "two billion, seven hundred eighty-eight million, six hundred thirty-one thousand, three hundred forty-five".