7867973991 has 8 divisors (see below), whose sum is σ = 10592483200. Its totient is φ = 5194390392.

The previous prime is 7867973989. The next prime is 7867974001. The reversal of 7867973991 is 1993797687.

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

It is not a de Polignac number, because 7867973991 - 2¹ = 7867973989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7867973921) 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, 12731041 + ... + 12731658.

It is an arithmetic number, because the mean of its divisors is an integer number (1324060400).

Almost surely, 2^7867973991 is an apocalyptic number.

7867973991 is a deficient number, since it is larger than the sum of its proper divisors (2724509209).

7867973991 is a wasteful number, since it uses less digits than its factorization.

7867973991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25462805.

The product of its digits is 36006768, while the sum is 66.

The square root of 7867973991 is about 88701.6008367380. The cubic root of 7867973991 is about 1988.9367476481.

The spelling of 7867973991 in words is "seven billion, eight hundred sixty-seven million, nine hundred seventy-three thousand, nine hundred ninety-one".