31863621072 has 40 divisors (see below), whose sum is σ = 86646691360. Its totient is φ = 10062195840.

The previous prime is 31863621059. The next prime is 31863621077. The reversal of 31863621072 is 27012636813.

It is a self number, because there is not a number n which added to its sum of digits gives 31863621072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31863621077) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 17468179 + ... + 17470002.

It is an arithmetic number, because the mean of its divisors is an integer number (2166167284).

Almost surely, 2^31863621072 is an apocalyptic number.

It is an amenable number.

31863621072 is an abundant number, since it is smaller than the sum of its proper divisors (54783070288).

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

31863621072 is a wasteful number, since it uses less digits than its factorization.

31863621072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34938211 (or 34938205 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 31863621072 in words is "thirty-one billion, eight hundred sixty-three million, six hundred twenty-one thousand, seventy-two".