28504306560 has 256 divisors, whose sum is σ = 95389747200. Its totient is φ = 7230382080.

The previous prime is 28504306547. The next prime is 28504306627. The reversal of 28504306560 is 6560340582.

It is a congruent number.

It is an unprimeable number.

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, 3507622 + ... + 3515738.

It is an arithmetic number, because the mean of its divisors is an integer number (372616200).

Almost surely, 2^28504306560 is an apocalyptic number.

28504306560 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 28504306560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47694873600).

28504306560 is an abundant number, since it is smaller than the sum of its proper divisors (66885440640).

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

28504306560 is a wasteful number, since it uses less digits than its factorization.

28504306560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229 (or 8217 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 28504306560 in words is "twenty-eight billion, five hundred four million, three hundred six thousand, five hundred sixty".