7856982891 has 12 divisors (see below), whose sum is σ = 11715071680. Its totient is φ = 5069021040.

The previous prime is 7856982869. The next prime is 7856982907. The reversal of 7856982891 is 1982896587.

It is a happy number.

It is not a de Polignac number, because 7856982891 - 2⁹ = 7856982379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7856902891) 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, 14080336 + ... + 14080893.

Almost surely, 2^7856982891 is an apocalyptic number.

7856982891 is a deficient number, since it is larger than the sum of its proper divisors (3858088789).

7856982891 is a wasteful number, since it uses less digits than its factorization.

7856982891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28161266 (or 28161263 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The square root of 7856982891 is about 88639.6237074594. The cubic root of 7856982891 is about 1988.0101732446.

The spelling of 7856982891 in words is "seven billion, eight hundred fifty-six million, nine hundred eighty-two thousand, eight hundred ninety-one".