28686354928 has 240 divisors, whose sum is σ = 73038182400. Its totient is φ = 10592064000.

The previous prime is 28686354911. The next prime is 28686354941. The reversal of 28686354928 is 82945368682.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192525798 + ... + 192525946.

It is an arithmetic number, because the mean of its divisors is an integer number (304325760).

Almost surely, 2^28686354928 is an apocalyptic number.

28686354928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28686354928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36519091200).

28686354928 is an abundant number, since it is smaller than the sum of its proper divisors (44351827472).

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

28686354928 is a wasteful number, since it uses less digits than its factorization.

28686354928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 271 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 61.

The spelling of 28686354928 in words is "twenty-eight billion, six hundred eighty-six million, three hundred fifty-four thousand, nine hundred twenty-eight".