7881666840 has 96 divisors (see below), whose sum is σ = 25629486480. Its totient is φ = 2100623616.

The previous prime is 7881666829. The next prime is 7881666853. The reversal of 7881666840 is 486661887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 800427 + ... + 810213.

Almost surely, 2^7881666840 is an apocalyptic number.

It is an amenable number.

7881666840 is an abundant number, since it is smaller than the sum of its proper divisors (17747819640).

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

7881666840 is a wasteful number, since it uses less digits than its factorization.

7881666840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12041 (or 12034 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 7881666840 is about 88778.7521876716. The cubic root of 7881666840 is about 1990.0898791926.

The spelling of 7881666840 in words is "seven billion, eight hundred eighty-one million, six hundred sixty-six thousand, eight hundred forty".