7944811987 has 8 divisors (see below), whose sum is σ = 9080408576. Its totient is φ = 6809371272.

The previous prime is 7944811951. The next prime is 7944812017. The reversal of 7944811987 is 7891184497.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7944811987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7944811937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106438 + ... + 164980.

It is an arithmetic number, because the mean of its divisors is an integer number (1135051072).

Almost surely, 2^7944811987 is an apocalyptic number.

7944811987 is a deficient number, since it is larger than the sum of its proper divisors (1135596589).

7944811987 is a wasteful number, since it uses less digits than its factorization.

7944811987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77937.

The product of its digits is 4064256, while the sum is 58.

The square root of 7944811987 is about 89133.6748204628. The cubic root of 7944811987 is about 1995.3903827936.

The spelling of 7944811987 in words is "seven billion, nine hundred forty-four million, eight hundred eleven thousand, nine hundred eighty-seven".