28501720260 has 768 divisors, whose sum is σ = 102419251200. Its totient is φ = 5840142336.

The previous prime is 28501720249. The next prime is 28501720283. The reversal of 28501720260 is 6202710582.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 343394179 + ... + 343394261.

It is an arithmetic number, because the mean of its divisors is an integer number (133358400).

Almost surely, 2^28501720260 is an apocalyptic number.

28501720260 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 28501720260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51209625600).

28501720260 is an abundant number, since it is smaller than the sum of its proper divisors (73917530940).

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

28501720260 is a wasteful number, since it uses less digits than its factorization.

28501720260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 28501720260 in words is "twenty-eight billion, five hundred one million, seven hundred twenty thousand, two hundred sixty".