28218187031 has 16 divisors (see below), whose sum is σ = 29881764864. Its totient is φ = 26592792864.

The previous prime is 28218187021. The next prime is 28218187093. The reversal of 28218187031 is 13078181282.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28218187031 is a prime.

It is a super-2 number, since 2×28218187031² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28218187031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218187021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680465 + ... + 720741.

It is an arithmetic number, because the mean of its divisors is an integer number (1867610304).

Almost surely, 2^28218187031 is an apocalyptic number.

28218187031 is a deficient number, since it is larger than the sum of its proper divisors (1663577833).

28218187031 is a wasteful number, since it uses less digits than its factorization.

28218187031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40750.

The product of its (nonzero) digits is 43008, while the sum is 41.

The spelling of 28218187031 in words is "twenty-eight billion, two hundred eighteen million, one hundred eighty-seven thousand, thirty-one".