28180109 has 8 divisors (see below), whose sum is σ = 28727328. Its totient is φ = 27635760.

The previous prime is 28180099. The next prime is 28180121. The reversal of 28180109 is 90108182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28180109 - 2¹² = 28176013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28180189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35414 + ... + 36200.

It is an arithmetic number, because the mean of its divisors is an integer number (3590916).

Almost surely, 2^28180109 is an apocalyptic number.

It is an amenable number.

28180109 is a deficient number, since it is larger than the sum of its proper divisors (547219).

28180109 is an equidigital number, since it uses as much as digits as its factorization.

28180109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 28180109 is about 5308.4940425699. The cubic root of 28180109 is about 304.3085977842.

The spelling of 28180109 in words is "twenty-eight million, one hundred eighty thousand, one hundred nine".