8131866772 has 24 divisors (see below), whose sum is σ = 15035479200. Its totient is φ = 3837607776.

The previous prime is 8131866767. The next prime is 8131866779. The reversal of 8131866772 is 2776681318.

It is a happy number.

It is a super-2 number, since 2×8131866772² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131866779) 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, 178438 + ... + 219325.

It is an arithmetic number, because the mean of its divisors is an integer number (626478300).

Almost surely, 2^8131866772 is an apocalyptic number.

It is an amenable number.

8131866772 is a deficient number, since it is larger than the sum of its proper divisors (6903612428).

8131866772 is a wasteful number, since it uses less digits than its factorization.

8131866772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398055 (or 398053 counting only the distinct ones).

The product of its digits is 677376, while the sum is 49.

The square root of 8131866772 is about 90176.8638399008. The cubic root of 8131866772 is about 2010.9290666332.

The spelling of 8131866772 in words is "eight billion, one hundred thirty-one million, eight hundred sixty-six thousand, seven hundred seventy-two".