28550880 has 120 divisors (see below), whose sum is σ = 100806552. Its totient is φ = 7610112.

The previous prime is 28550869. The next prime is 28550887. The reversal of 28550880 is 8805582.

28550880 is a `hidden beast` number, since 28 + 550 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28550887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11859 + ... + 14061.

Almost surely, 2^28550880 is an apocalyptic number.

28550880 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 28550880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50403276).

28550880 is an abundant number, since it is smaller than the sum of its proper divisors (72255672).

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

28550880 is a wasteful number, since it uses less digits than its factorization.

28550880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230 (or 2213 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 28550880 is about 5343.3023496710. The cubic root of 28550880 is about 305.6374021088.

The spelling of 28550880 in words is "twenty-eight million, five hundred fifty thousand, eight hundred eighty".