7891982891987 has 32 divisors (see below), whose sum is σ = 8306167403520. Its totient is φ = 7488511672320.

The previous prime is 7891982891983. The next prime is 7891982891993.

7891982891987 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 7891982891987 - 2² = 7891982891983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7891982891899 and 7891982891908.

It is not an unprimeable number, because it can be changed into a prime (7891982891983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309999563 + ... + 310025019.

It is an arithmetic number, because the mean of its divisors is an integer number (259567731360).

Almost surely, 2^{7891982891987} is an apocalyptic number.

7891982891987 is a deficient number, since it is larger than the sum of its proper divisors (414184511533).

7891982891987 is a wasteful number, since it uses less digits than its factorization.

7891982891987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26351.

The product of its digits is 2633637888, while the sum is 86.

The spelling of 7891982891987 in words is "seven trillion, eight hundred ninety-one billion, nine hundred eighty-two million, eight hundred ninety-one thousand, nine hundred eighty-seven".