28505028 has 48 divisors (see below), whose sum is σ = 69572160. Its totient is φ = 9072000.

The previous prime is 28505021. The next prime is 28505051. The reversal of 28505028 is 82050582.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28504986 and 28505004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34743 + ... + 35553.

It is an arithmetic number, because the mean of its divisors is an integer number (1449420).

Almost surely, 2^28505028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28505028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34786080).

28505028 is an abundant number, since it is smaller than the sum of its proper divisors (41067132).

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

28505028 is a wasteful number, since it uses less digits than its factorization.

28505028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28505028 is about 5339.0100205937. The cubic root of 28505028 is about 305.4736990991.

The spelling of 28505028 in words is "twenty-eight million, five hundred five thousand, twenty-eight".