28141209 has 8 divisors (see below), whose sum is σ = 41690720. Its totient is φ = 18760788.

The previous prime is 28141207. The next prime is 28141231. The reversal of 28141209 is 90214182.

It is not a de Polignac number, because 28141209 - 2¹ = 28141207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1042267 = 28141209 / (2 + 8 + 1 + 4 + 1 + 2 + 0 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28141207) 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, 521107 + ... + 521160.

It is an arithmetic number, because the mean of its divisors is an integer number (5211340).

Almost surely, 2^28141209 is an apocalyptic number.

It is an amenable number.

28141209 is a deficient number, since it is larger than the sum of its proper divisors (13549511).

28141209 is a wasteful number, since it uses less digits than its factorization.

28141209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042276 (or 1042270 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28141209 is about 5304.8288379551. The cubic root of 28141209 is about 304.1685101367.

The spelling of 28141209 in words is "twenty-eight million, one hundred forty-one thousand, two hundred nine".