28221968780 has 12 divisors (see below), whose sum is σ = 59266134480. Its totient is φ = 11288787504.

The previous prime is 28221968777. The next prime is 28221968813. The reversal of 28221968780 is 8786912282.

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 3 ways as a sum of consecutive naturals, for example, 705549200 + ... + 705549239.

It is an arithmetic number, because the mean of its divisors is an integer number (4938844540).

Almost surely, 2^28221968780 is an apocalyptic number.

28221968780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28221968780 is an abundant number, since it is smaller than the sum of its proper divisors (31044165700).

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

28221968780 is a wasteful number, since it uses less digits than its factorization.

28221968780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411098448 (or 1411098446 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 28221968780 in words is "twenty-eight billion, two hundred twenty-one million, nine hundred sixty-eight thousand, seven hundred eighty".