28524777780 has 96 divisors (see below), whose sum is σ = 82122243840. Its totient is φ = 7392522240.

The previous prime is 28524777739. The next prime is 28524777791. The reversal of 28524777780 is 8777742582.

It is a self number, because there is not a number n which added to its sum of digits gives 28524777780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2055465 + ... + 2069295.

It is an arithmetic number, because the mean of its divisors is an integer number (855440040).

Almost surely, 2^28524777780 is an apocalyptic number.

28524777780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28524777780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41061121920).

28524777780 is an abundant number, since it is smaller than the sum of its proper divisors (53597466060).

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

28524777780 is a wasteful number, since it uses less digits than its factorization.

28524777780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14809 (or 14807 counting only the distinct ones).

The product of its (nonzero) digits is 12293120, while the sum is 57.

The spelling of 28524777780 in words is "twenty-eight billion, five hundred twenty-four million, seven hundred seventy-seven thousand, seven hundred eighty".