28205180 has 36 divisors (see below), whose sum is σ = 60376680. Its totient is φ = 11067840.

The previous prime is 28205179. The next prime is 28205183. The reversal of 28205180 is 8150282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74231 + ... + 74609.

It is an arithmetic number, because the mean of its divisors is an integer number (1677130).

Almost surely, 2^28205180 is an apocalyptic number.

28205180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28205180 is an abundant number, since it is smaller than the sum of its proper divisors (32171500).

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

28205180 is a wasteful number, since it uses less digits than its factorization.

28205180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 28205180 is about 5310.8549217617. The cubic root of 28205180 is about 304.3988157869.

It can be divided in two parts, 2820 and 5180, that added together give a cube (8000 = 20³).

The spelling of 28205180 in words is "twenty-eight million, two hundred five thousand, one hundred eighty".