28908189 has 6 divisors (see below), whose sum is σ = 41756286. Its totient is φ = 19272120.

The previous prime is 28908091. The next prime is 28908193. The reversal of 28908189 is 98180982.

It can be written as a sum of positive squares in only one way, i.e., 28836900 + 71289 = 5370^2 + 267^2 .

It is not a de Polignac number, because 28908189 - 2⁸ = 28907933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28908199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1606002 + ... + 1606019.

It is an arithmetic number, because the mean of its divisors is an integer number (6959381).

Almost surely, 2^28908189 is an apocalyptic number.

It is an amenable number.

28908189 is a deficient number, since it is larger than the sum of its proper divisors (12848097).

28908189 is a wasteful number, since it uses less digits than its factorization.

28908189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212027 (or 3212024 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28908189 is about 5376.6336122150. The cubic root of 28908189 is about 306.9071185737.

The spelling of 28908189 in words is "twenty-eight million, nine hundred eight thousand, one hundred eighty-nine".