7866940040 has 32 divisors (see below), whose sum is σ = 17829829080. Its totient is φ = 3123804672.

The previous prime is 7866940031. The next prime is 7866940051. The reversal of 7866940040 is 400496687.

It can be written as a sum of positive squares in 4 ways, for example, as 5260020676 + 2606919364 = 72526^2 + 51058^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7866939973 and 7866940000.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 712307 + ... + 723266.

Almost surely, 2^7866940040 is an apocalyptic number.

It is an amenable number.

7866940040 is an abundant number, since it is smaller than the sum of its proper divisors (9962889040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7866940040 is a wasteful number, since it uses less digits than its factorization.

7866940040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435721 (or 1435717 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 7866940040 is about 88695.7723907966. The cubic root of 7866940040 is about 1988.8496200415.

The spelling of 7866940040 in words is "seven billion, eight hundred sixty-six million, nine hundred forty thousand, forty".