28284431680 has 56 divisors (see below), whose sum is σ = 67836958560. Its totient is φ = 11232360960.

The previous prime is 28284431671. The next prime is 28284431701. The reversal of 28284431680 is 8613448282.

It is a self number, because there is not a number n which added to its sum of digits gives 28284431680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273466 + ... + 362425.

It is an arithmetic number, because the mean of its divisors is an integer number (1211374260).

Almost surely, 2^28284431680 is an apocalyptic number.

28284431680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28284431680 is an abundant number, since it is smaller than the sum of its proper divisors (39552526880).

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

28284431680 is a wasteful number, since it uses less digits than its factorization.

28284431680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636047 (or 636037 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 46.

The spelling of 28284431680 in words is "twenty-eight billion, two hundred eighty-four million, four hundred thirty-one thousand, six hundred eighty".