28288180 has 12 divisors (see below), whose sum is σ = 59405220. Its totient is φ = 11315264.

The previous prime is 28288177. The next prime is 28288193. The reversal of 28288180 is 8188282.

It can be written as a sum of positive squares in 2 ways, for example, as 10614564 + 17673616 = 3258^2 + 4204^2 .

It is a super-2 number, since 2×28288180² = 1600442255424800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707185 + ... + 707224.

It is an arithmetic number, because the mean of its divisors is an integer number (4950435).

Almost surely, 2^28288180 is an apocalyptic number.

28288180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28288180 is an abundant number, since it is smaller than the sum of its proper divisors (31117040).

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

28288180 is a wasteful number, since it uses less digits than its factorization.

28288180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414418 (or 1414416 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 37.

The square root of 28288180 is about 5318.6633659219. The cubic root of 28288180 is about 304.6971103960.

The spelling of 28288180 in words is "twenty-eight million, two hundred eighty-eight thousand, one hundred eighty".