31785021044 has 24 divisors (see below), whose sum is σ = 63773158848. Its totient is φ = 13578626880.

The previous prime is 31785021019. The next prime is 31785021049. The reversal of 31785021044 is 44012058713.

It is a junction number, because it is equal to n+sod(n) for n = 31785020995 and 31785021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31785021049) 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, 1804622 + ... + 1822149.

It is an arithmetic number, because the mean of its divisors is an integer number (2657214952).

Almost surely, 2^31785021044 is an apocalyptic number.

It is an amenable number.

31785021044 is an abundant number, since it is smaller than the sum of its proper divisors (31988137804).

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

31785021044 is a wasteful number, since it uses less digits than its factorization.

31785021044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627095 (or 3627093 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

Adding to 31785021044 its reverse (44012058713), we get a palindrome (75797079757).

The spelling of 31785021044 in words is "thirty-one billion, seven hundred eighty-five million, twenty-one thousand, forty-four".