28781889180 has 96 divisors (see below), whose sum is σ = 89960226048. Its totient is φ = 6815155200.

The previous prime is 28781889163. The next prime is 28781889181. The reversal of 28781889180 is 8198818782.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781889181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478701 + ... + 535460.

It is an arithmetic number, because the mean of its divisors is an integer number (937085688).

Almost surely, 2^28781889180 is an apocalyptic number.

28781889180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28781889180 is an abundant number, since it is smaller than the sum of its proper divisors (61178336868).

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

28781889180 is a wasteful number, since it uses less digits than its factorization.

28781889180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014227 (or 1014225 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 60.

The spelling of 28781889180 in words is "twenty-eight billion, seven hundred eighty-one million, eight hundred eighty-nine thousand, one hundred eighty".