2861131688 has 32 divisors (see below), whose sum is σ = 5694186600. Its totient is φ = 1343096832.

The previous prime is 2861131687. The next prime is 2861131699. The reversal of 2861131688 is 8861311682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2598756484 + 262375204 = 50978^2 + 16198^2 .

It is not an unprimeable number, because it can be changed into a prime (2861131687) 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, 29906 + ... + 81342.

Almost surely, 2^2861131688 is an apocalyptic number.

It is an amenable number.

2861131688 is a deficient number, since it is larger than the sum of its proper divisors (2833054912).

2861131688 is a wasteful number, since it uses less digits than its factorization.

2861131688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51869 (or 51865 counting only the distinct ones).

The product of its digits is 110592, while the sum is 44.

The square root of 2861131688 is about 53489.5474649020. The cubic root of 2861131688 is about 1419.6434481377.

The spelling of 2861131688 in words is "two billion, eight hundred sixty-one million, one hundred thirty-one thousand, six hundred eighty-eight".