28718880 has 192 divisors, whose sum is σ = 98703360. Its totient is φ = 6994944.

The previous prime is 28718873. The next prime is 28718897. The reversal of 28718880 is 8881782.

It is a happy number.

It is a Cunningham number, because it is equal to 5359²-1.

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, 428607 + ... + 428673.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^28718880 is an apocalyptic number.

28718880 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 28718880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49351680).

28718880 is an abundant number, since it is smaller than the sum of its proper divisors (69984480).

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

28718880 is a wasteful number, since it uses less digits than its factorization.

28718880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 28718880 is about 5358.9999066990. Note that the first 4 decimals coincide. The cubic root of 28718880 is about 306.2357105647.

The spelling of 28718880 in words is "twenty-eight million, seven hundred eighteen thousand, eight hundred eighty".