28109914452 has 72 divisors (see below), whose sum is σ = 72536143680. Its totient is φ = 9175952640.

The previous prime is 28109914403. The next prime is 28109914487. The reversal of 28109914452 is 25441990182.

It is a happy number.

28109914452 is a `hidden beast` number, since 2 + 8 + 109 + 91 + 4 + 452 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28109914398 and 28109914407.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 533452 + ... + 583772.

It is an arithmetic number, because the mean of its divisors is an integer number (1007446440).

Almost surely, 2^28109914452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28109914452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36268071840).

28109914452 is an abundant number, since it is smaller than the sum of its proper divisors (44426229228).

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

28109914452 is a wasteful number, since it uses less digits than its factorization.

28109914452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50653 (or 50648 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 28109914452 in words is "twenty-eight billion, one hundred nine million, nine hundred fourteen thousand, four hundred fifty-two".