28505008 has 40 divisors (see below), whose sum is σ = 63607040. Its totient is φ = 12121920.

The previous prime is 28505003. The next prime is 28505011. The reversal of 28505008 is 80050582.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (28505003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14653 + ... + 16483.

It is an arithmetic number, because the mean of its divisors is an integer number (1590176).

Almost surely, 2^28505008 is an apocalyptic number.

28505008 is a gapful number since it is divisible by the number (28) 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 28505008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31803520).

28505008 is an abundant number, since it is smaller than the sum of its proper divisors (35102032).

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

28505008 is a wasteful number, since it uses less digits than its factorization.

28505008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 28505008 is about 5339.0081475870. The cubic root of 28505008 is about 305.4736276559.

The spelling of 28505008 in words is "twenty-eight million, five hundred five thousand, eight".