2640078791 has 12 divisors (see below), whose sum is σ = 3078430920. Its totient is φ = 2257531920.

The previous prime is 2640078773. The next prime is 2640078803. The reversal of 2640078791 is 1978700462.

It is not a de Polignac number, because 2640078791 - 2¹⁰ = 2640077767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640072791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43361 + ... + 84618.

It is an arithmetic number, because the mean of its divisors is an integer number (256535910).

Almost surely, 2^2640078791 is an apocalyptic number.

2640078791 is a deficient number, since it is larger than the sum of its proper divisors (438352129).

2640078791 is a wasteful number, since it uses less digits than its factorization.

2640078791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128414 (or 128407 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 2640078791 is about 51381.6970428187. The cubic root of 2640078791 is about 1382.0983953391.

The spelling of 2640078791 in words is "two billion, six hundred forty million, seventy-eight thousand, seven hundred ninety-one".