7997388771 has 4 divisors (see below), whose sum is σ = 10663185032. Its totient is φ = 5331592512.

The previous prime is 7997388709. The next prime is 7997388787. The reversal of 7997388771 is 1778837997.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7997388771 - 2¹⁴ = 7997372387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7997387771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332898126 + ... + 1332898131.

It is an arithmetic number, because the mean of its divisors is an integer number (2665796258).

Almost surely, 2^7997388771 is an apocalyptic number.

7997388771 is a deficient number, since it is larger than the sum of its proper divisors (2665796261).

7997388771 is a wasteful number, since it uses less digits than its factorization.

7997388771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665796260.

The product of its digits is 37340352, while the sum is 66.

The square root of 7997388771 is about 89428.1206947792. The cubic root of 7997388771 is about 1999.7823739036.

The spelling of 7997388771 in words is "seven billion, nine hundred ninety-seven million, three hundred eighty-eight thousand, seven hundred seventy-one".