28566881280 has 704 divisors, whose sum is σ = 118425991680. Its totient is φ = 6394871808.

The previous prime is 28566881279. The next prime is 28566881281. The reversal of 28566881280 is 8218866582.

It is a happy number.

28566881280 is a `hidden beast` number, since 285 + 6 + 6 + 8 + 81 + 280 = 666.

It is an interprime number because it is at equal distance from previous prime (28566881279) and next prime (28566881281).

It is a super-2 number, since 2×28566881280² (a number of 22 digits) contains 22 as substring.

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 (28566881281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51286762 + ... + 51287318.

Almost surely, 2^28566881280 is an apocalyptic number.

28566881280 is a gapful number since it is divisible by the number (20) 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 28566881280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59212995840).

28566881280 is an abundant number, since it is smaller than the sum of its proper divisors (89859110400).

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

28566881280 is a wasteful number, since it uses less digits than its factorization.

28566881280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 54.

The spelling of 28566881280 in words is "twenty-eight billion, five hundred sixty-six million, eight hundred eighty-one thousand, two hundred eighty".