28219144556 has 12 divisors (see below), whose sum is σ = 49656341280. Its totient is φ = 14031618480.

The previous prime is 28219144553. The next prime is 28219144589. The reversal of 28219144556 is 65544191282.

It is a self number, because there is not a number n which added to its sum of digits gives 28219144556.

It is not an unprimeable number, because it can be changed into a prime (28219144553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19487636 + ... + 19489083.

It is an arithmetic number, because the mean of its divisors is an integer number (4138028440).

Almost surely, 2^28219144556 is an apocalyptic number.

It is an amenable number.

28219144556 is a deficient number, since it is larger than the sum of its proper divisors (21437196724).

28219144556 is a wasteful number, since it uses less digits than its factorization.

28219144556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38976904 (or 38976902 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The spelling of 28219144556 in words is "twenty-eight billion, two hundred nineteen million, one hundred forty-four thousand, five hundred fifty-six".