28185180 has 24 divisors (see below), whose sum is σ = 78918672. Its totient is φ = 7516032.

The previous prime is 28185137. The next prime is 28185181. The reversal of 28185180 is 8158182.

28185180 is nontrivially palindromic in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28185181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234817 + ... + 234936.

It is an arithmetic number, because the mean of its divisors is an integer number (3288278).

Almost surely, 2^28185180 is an apocalyptic number.

28185180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28185180 is an abundant number, since it is smaller than the sum of its proper divisors (50733492).

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

28185180 is a wasteful number, since it uses less digits than its factorization.

28185180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469765 (or 469763 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 28185180 is about 5308.9716518362. The cubic root of 28185180 is about 304.3268500953.

The spelling of 28185180 in words is "twenty-eight million, one hundred eighty-five thousand, one hundred eighty".