28081801224 has 48 divisors (see below), whose sum is σ = 78871731120. Its totient is φ = 9360599760.

The previous prime is 28081801193. The next prime is 28081801229. The reversal of 28081801224 is 42210818082.

28081801224 is a `hidden beast` number, since 280 + 81 + 80 + 1 + 224 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28081801229) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7220742 + ... + 7224629.

It is an arithmetic number, because the mean of its divisors is an integer number (1643161065).

Almost surely, 2^28081801224 is an apocalyptic number.

28081801224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28081801224 is an abundant number, since it is smaller than the sum of its proper divisors (50789929896).

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

28081801224 is a wasteful number, since it uses less digits than its factorization.

28081801224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14445392 (or 14445376 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 28081801224 in words is "twenty-eight billion, eighty-one million, eight hundred one thousand, two hundred twenty-four".