28628358985728 has 336 divisors, whose sum is σ = 86131536472800. Its totient is φ = 9508686888960.

The previous prime is 28628358985693. The next prime is 28628358985783. The reversal of 28628358985728 is 82758985382682.

28628358985728 is a `hidden beast` number, since 2 + 8 + 6 + 2 + 8 + 3 + 589 + 8 + 5 + 7 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 419496633 + ... + 419564871.

It is an arithmetic number, because the mean of its divisors is an integer number (256343858550).

Almost surely, 2^{28628358985728} 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 28628358985728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43065768236400).

28628358985728 is an abundant number, since it is smaller than the sum of its proper divisors (57503177487072).

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

28628358985728 is an frugal number, since it uses more digits than its factorization.

28628358985728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68560 (or 68525 counting only the distinct ones).

The product of its digits is 7431782400, while the sum is 81.

The spelling of 28628358985728 in words is "twenty-eight trillion, six hundred twenty-eight billion, three hundred fifty-eight million, nine hundred eighty-five thousand, seven hundred twenty-eight".