2640372813 has 12 divisors (see below), whose sum is σ = 4107246780. Its totient is φ = 1624844736.

The previous prime is 2640372793. The next prime is 2640372821. The reversal of 2640372813 is 3182730462.

It is a happy number.

2640372813 is a `hidden beast` number, since 2 + 640 + 3 + 7 + 2 + 8 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 221503689 + 2418869124 = 14883^2 + 49182^2 .

It is not a de Polignac number, because 2640372813 - 2⁵ = 2640372781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640372853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11283528 + ... + 11283761.

It is an arithmetic number, because the mean of its divisors is an integer number (342270565).

Almost surely, 2^2640372813 is an apocalyptic number.

It is an amenable number.

2640372813 is a deficient number, since it is larger than the sum of its proper divisors (1466873967).

2640372813 is a wasteful number, since it uses less digits than its factorization.

2640372813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22567308 (or 22567305 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 2640372813 is about 51384.5581181740. The cubic root of 2640372813 is about 1382.1497009101.

The spelling of 2640372813 in words is "two billion, six hundred forty million, three hundred seventy-two thousand, eight hundred thirteen".