28727525556 has 192 divisors, whose sum is σ = 78188544000. Its totient is φ = 9114094080.

The previous prime is 28727525539. The next prime is 28727525557. The reversal of 28727525556 is 65552572782.

It is a happy number.

28727525556 is a `hidden beast` number, since 2 + 87 + 2 + 7 + 5 + 2 + 5 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28727525557) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28470780 + ... + 28471788.

It is an arithmetic number, because the mean of its divisors is an integer number (407232000).

Almost surely, 2^28727525556 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 28727525556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39094272000).

28727525556 is an abundant number, since it is smaller than the sum of its proper divisors (49461018444).

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

28727525556 is a wasteful number, since it uses less digits than its factorization.

28727525556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1211 counting only the distinct ones).

The product of its digits is 11760000, while the sum is 54.

The spelling of 28727525556 in words is "twenty-eight billion, seven hundred twenty-seven million, five hundred twenty-five thousand, five hundred fifty-six".