28512804860 has 48 divisors (see below), whose sum is σ = 63121161600. Its totient is φ = 10788934464.

The previous prime is 28512804809. The next prime is 28512804863. The reversal of 28512804860 is 6840821582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28512804863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204611 + ... + 314469.

It is an arithmetic number, because the mean of its divisors is an integer number (1315024200).

Almost surely, 2^28512804860 is an apocalyptic number.

28512804860 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 28512804860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31560580800).

28512804860 is an abundant number, since it is smaller than the sum of its proper divisors (34608356740).

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

28512804860 is a wasteful number, since it uses less digits than its factorization.

28512804860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110570 (or 110568 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 28512804860 in words is "twenty-eight billion, five hundred twelve million, eight hundred four thousand, eight hundred sixty".