28718788280 has 96 divisors (see below), whose sum is σ = 80949183840. Its totient is φ = 9089015040.

The previous prime is 28718788207. The next prime is 28718788283. The reversal of 28718788280 is 8288781782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28718788283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538076 + ... + 589035.

It is an arithmetic number, because the mean of its divisors is an integer number (843220665).

Almost surely, 2^28718788280 is an apocalyptic number.

28718788280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28718788280 is an abundant number, since it is smaller than the sum of its proper divisors (52230395560).

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

28718788280 is a wasteful number, since it uses less digits than its factorization.

28718788280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127149 (or 1127138 counting only the distinct ones).

The product of its (nonzero) digits is 6422528, while the sum is 59.

The spelling of 28718788280 in words is "twenty-eight billion, seven hundred eighteen million, seven hundred eighty-eight thousand, two hundred eighty".