7811671968 has 48 divisors (see below), whose sum is σ = 22784045760. Its totient is φ = 2603890368.

The previous prime is 7811671963. The next prime is 7811671969. The reversal of 7811671968 is 8691761187.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×7811671968² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (7811671963) 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, 4519780 + ... + 4521507.

It is an arithmetic number, because the mean of its divisors is an integer number (474667620).

Almost surely, 2^7811671968 is an apocalyptic number.

It is an amenable number.

7811671968 is an abundant number, since it is smaller than the sum of its proper divisors (14972373792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7811671968 is a wasteful number, since it uses less digits than its factorization.

7811671968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9041306 (or 9041292 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 7811671968 is about 88383.6634678604. The cubic root of 7811671968 is about 1984.1812101438.

The spelling of 7811671968 in words is "seven billion, eight hundred eleven million, six hundred seventy-one thousand, nine hundred sixty-eight".