28445880 has 64 divisors (see below), whose sum is σ = 85800960. Its totient is φ = 7544448.

The previous prime is 28445863. The next prime is 28445881. The reversal of 28445880 is 8854482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26229 + ... + 27291.

It is an arithmetic number, because the mean of its divisors is an integer number (1340640).

Almost surely, 2^28445880 is an apocalyptic number.

28445880 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 28445880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42900480).

28445880 is an abundant number, since it is smaller than the sum of its proper divisors (57355080).

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

28445880 is a wasteful number, since it uses less digits than its factorization.

28445880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 39.

The square root of 28445880 is about 5333.4679149686. The cubic root of 28445880 is about 305.2622665764.

It can be divided in two parts, 284 and 45880, that added together give a palindrome (46164).

The spelling of 28445880 in words is "twenty-eight million, four hundred forty-five thousand, eight hundred eighty".