28550320 has 40 divisors (see below), whose sum is σ = 66808224. Its totient is φ = 11346432.

The previous prime is 28550317. The next prime is 28550339. The reversal of 28550320 is 2305582.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12292 + ... + 14428.

Almost surely, 2^28550320 is an apocalyptic number.

28550320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

28550320 is the 2672-nd decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28550320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33404112).

28550320 is an abundant number, since it is smaller than the sum of its proper divisors (38257904).

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

28550320 is a wasteful number, since it uses less digits than its factorization.

28550320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317 (or 2311 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 28550320 is about 5343.2499473635. The cubic root of 28550320 is about 305.6354038275.

It can be divided in two parts, 285 and 50320, that added together give a palindrome (50605).

The spelling of 28550320 in words is "twenty-eight million, five hundred fifty thousand, three hundred twenty".