7681406771 has 4 divisors (see below), whose sum is σ = 7682038200. Its totient is φ = 7680775344.

The previous prime is 7681406753. The next prime is 7681406779. The reversal of 7681406771 is 1776041867.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7681406771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7681406779) 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, 297101 + ... + 321918.

It is an arithmetic number, because the mean of its divisors is an integer number (1920509550).

Almost surely, 2^7681406771 is an apocalyptic number.

7681406771 is a deficient number, since it is larger than the sum of its proper divisors (631429).

7681406771 is a wasteful number, since it uses less digits than its factorization.

7681406771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631428.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 7681406771 is about 87643.6350854984. The cubic root of 7681406771 is about 1973.0901172357.

The spelling of 7681406771 in words is "seven billion, six hundred eighty-one million, four hundred six thousand, seven hundred seventy-one".