28281961981600 has 72 divisors (see below), whose sum is σ = 69424794958428. Its totient is φ = 11250283161600.

The previous prime is 28281961981589. The next prime is 28281961981613. The reversal of 28281961981600 is 618916918282.

It can be written as a sum of positive squares in 6 ways, for example, as 2326564494864 + 25955397486736 = 1525308^2 + 5094644^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97513909 + ... + 97803508.

Almost surely, 2^{28281961981600} is an apocalyptic number.

28281961981600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28281961981600 is an abundant number, since it is smaller than the sum of its proper divisors (41142832976828).

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

28281961981600 is a wasteful number, since it uses less digits than its factorization.

28281961981600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195317618 (or 195317605 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 61.

The spelling of 28281961981600 in words is "twenty-eight trillion, two hundred eighty-one billion, nine hundred sixty-one million, nine hundred eighty-one thousand, six hundred".