28681327488 has 256 divisors, whose sum is σ = 89530214400. Its totient is φ = 8041420800.

The previous prime is 28681327463. The next prime is 28681327537. The reversal of 28681327488 is 88472318682.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3446853 + ... + 3455163.

It is an arithmetic number, because the mean of its divisors is an integer number (349727400).

Almost surely, 2^28681327488 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 28681327488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44765107200).

28681327488 is an abundant number, since it is smaller than the sum of its proper divisors (60848886912).

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

28681327488 is a wasteful number, since it uses less digits than its factorization.

28681327488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8401 (or 8389 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 57.

The spelling of 28681327488 in words is "twenty-eight billion, six hundred eighty-one million, three hundred twenty-seven thousand, four hundred eighty-eight".