31869945644 has 24 divisors (see below), whose sum is σ = 56329841568. Its totient is φ = 15775793280.

The previous prime is 31869945623. The next prime is 31869945649. The reversal of 31869945644 is 44654996813.

It is not an unprimeable number, because it can be changed into a prime (31869945649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1812704 + ... + 1830200.

It is an arithmetic number, because the mean of its divisors is an integer number (2347076732).

Almost surely, 2^31869945644 is an apocalyptic number.

It is an amenable number.

31869945644 is a deficient number, since it is larger than the sum of its proper divisors (24459895924).

31869945644 is a wasteful number, since it uses less digits than its factorization.

31869945644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22025 (or 22023 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 59.

The spelling of 31869945644 in words is "thirty-one billion, eight hundred sixty-nine million, nine hundred forty-five thousand, six hundred forty-four".