31823018028 has 18 divisors (see below), whose sum is σ = 80441517884. Its totient is φ = 10607672664.

The previous prime is 31823018023. The next prime is 31823018069. The reversal of 31823018028 is 82081032813.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 883972723 = 31823018028 / (3 + 1 + 8 + 2 + 3 + 0 + 1 + 8 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 31823017983 and 31823018001.

It is not an unprimeable number, because it can be changed into a prime (31823018023) 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 5 ways as a sum of consecutive naturals, for example, 441986326 + ... + 441986397.

Almost surely, 2^31823018028 is an apocalyptic number.

It is an amenable number.

31823018028 is an abundant number, since it is smaller than the sum of its proper divisors (48618499856).

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

31823018028 is a wasteful number, since it uses less digits than its factorization.

31823018028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883972733 (or 883972728 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 31823018028 in words is "thirty-one billion, eight hundred twenty-three million, eighteen thousand, twenty-eight".