2640867793 has 4 divisors (see below), whose sum is σ = 2644471348. Its totient is φ = 2637264240.

The previous prime is 2640867787. The next prime is 2640867821. The reversal of 2640867793 is 3977680462.

2640867793 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 2372956369 + 267911424 = 48713^2 + 16368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640867793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640867793.

It is not an unprimeable number, because it can be changed into a prime (2640867763) 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, 1800678 + ... + 1802143.

It is an arithmetic number, because the mean of its divisors is an integer number (661117837).

Almost surely, 2^2640867793 is an apocalyptic number.

It is an amenable number.

2640867793 is a deficient number, since it is larger than the sum of its proper divisors (3603555).

2640867793 is an equidigital number, since it uses as much as digits as its factorization.

2640867793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603554.

The product of its (nonzero) digits is 3048192, while the sum is 52.

The square root of 2640867793 is about 51389.3743199895. The cubic root of 2640867793 is about 1382.2360641829.

The spelling of 2640867793 in words is "two billion, six hundred forty million, eight hundred sixty-seven thousand, seven hundred ninety-three".