28255008280 has 64 divisors (see below), whose sum is σ = 65862247680. Its totient is φ = 10897804800.

The previous prime is 28255008259. The next prime is 28255008293. The reversal of 28255008280 is 8280055282.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302350 + ... + 384610.

It is an arithmetic number, because the mean of its divisors is an integer number (1029097620).

Almost surely, 2^28255008280 is an apocalyptic number.

28255008280 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 28255008280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32931123840).

28255008280 is an abundant number, since it is smaller than the sum of its proper divisors (37607239400).

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

28255008280 is a wasteful number, since it uses less digits than its factorization.

28255008280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82580 (or 82576 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 40.

It can be divided in two parts, 2825 and 5008280, that added together give a palindrome (5011105).

The spelling of 28255008280 in words is "twenty-eight billion, two hundred fifty-five million, eight thousand, two hundred eighty".