28550928 has 120 divisors (see below), whose sum is σ = 87643200. Its totient is φ = 7983360.

The previous prime is 28550923. The next prime is 28550947. The reversal of 28550928 is 82905582.

It is a super-2 number, since 2×28550928² = 1630310979322368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28550923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143373 + ... + 143571.

It is an arithmetic number, because the mean of its divisors is an integer number (730360).

Almost surely, 2^28550928 is an apocalyptic number.

28550928 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 28550928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43821600).

28550928 is an abundant number, since it is smaller than the sum of its proper divisors (59092272).

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

28550928 is a wasteful number, since it uses less digits than its factorization.

28550928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 28550928 is about 5343.3068412735. The cubic root of 28550928 is about 305.6375733888.

The spelling of 28550928 in words is "twenty-eight million, five hundred fifty thousand, nine hundred twenty-eight".