31106841728 has 16 divisors (see below), whose sum is σ = 61970661510. Its totient is φ = 15553420800.

The previous prime is 31106841713. The next prime is 31106841739. The reversal of 31106841728 is 82714860113.

It can be written as a sum of positive squares in only one way, i.e., 19267660864 + 11839180864 = 138808^2 + 108808^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121510973 + ... + 121511228.

Almost surely, 2^31106841728 is an apocalyptic number.

It is an amenable number.

31106841728 is a deficient number, since it is larger than the sum of its proper divisors (30863819782).

31106841728 is an equidigital number, since it uses as much as digits as its factorization.

31106841728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243022215 (or 243022203 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 31106841728 in words is "thirty-one billion, one hundred six million, eight hundred forty-one thousand, seven hundred twenty-eight".