31128286812 has 24 divisors (see below), whose sum is σ = 83008765056. Its totient is φ = 8893796208.

The previous prime is 31128286769. The next prime is 31128286837. The reversal of 31128286812 is 21868282113.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185287338 + ... + 185287505.

It is an arithmetic number, because the mean of its divisors is an integer number (3458698544).

Almost surely, 2^31128286812 is an apocalyptic number.

It is an amenable number.

31128286812 is an abundant number, since it is smaller than the sum of its proper divisors (51880478244).

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

31128286812 is a wasteful number, since it uses less digits than its factorization.

31128286812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370574857 (or 370574855 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The spelling of 31128286812 in words is "thirty-one billion, one hundred twenty-eight million, two hundred eighty-six thousand, eight hundred twelve".