2628840787 has 4 divisors (see below), whose sum is σ = 2699890576. Its totient is φ = 2557791000.

The previous prime is 2628840769. The next prime is 2628840833. The reversal of 2628840787 is 7870488262.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2628840787 - 2⁷ = 2628840659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2628844787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35524839 + ... + 35524912.

It is an arithmetic number, because the mean of its divisors is an integer number (674972644).

Almost surely, 2^2628840787 is an apocalyptic number.

2628840787 is a deficient number, since it is larger than the sum of its proper divisors (71049789).

2628840787 is an equidigital number, since it uses as much as digits as its factorization.

2628840787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71049788.

The product of its (nonzero) digits is 2408448, while the sum is 52.

The square root of 2628840787 is about 51272.2223723528. Note that the first 3 decimals coincide. The cubic root of 2628840787 is about 1380.1345501729.

The spelling of 2628840787 in words is "two billion, six hundred twenty-eight million, eight hundred forty thousand, seven hundred eighty-seven".