28326431718 has 72 divisors (see below), whose sum is σ = 68004019512. Its totient is φ = 8513092224.

The previous prime is 28326431711. The next prime is 28326431719. The reversal of 28326431718 is 81713462382.

28326431718 is a `hidden beast` number, since 2 + 8 + 326 + 4 + 317 + 1 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28326431711) 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 35 ways as a sum of consecutive naturals, for example, 22530 + ... + 239082.

It is an arithmetic number, because the mean of its divisors is an integer number (944500271).

Almost surely, 2^28326431718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28326431718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34002009756).

28326431718 is an abundant number, since it is smaller than the sum of its proper divisors (39677587794).

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

28326431718 is a wasteful number, since it uses less digits than its factorization.

28326431718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216630 (or 216614 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 28326431718 in words is "twenty-eight billion, three hundred twenty-six million, four hundred thirty-one thousand, seven hundred eighteen".