28609238 has 24 divisors (see below), whose sum is σ = 50122152. Its totient is φ = 12211584.

The previous prime is 28609213. The next prime is 28609247. The reversal of 28609238 is 83290682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34181 + ... + 35007.

It is an arithmetic number, because the mean of its divisors is an integer number (2088423).

Almost surely, 2^28609238 is an apocalyptic number.

28609238 is a deficient number, since it is larger than the sum of its proper divisors (21512914).

28609238 is a wasteful number, since it uses less digits than its factorization.

28609238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1189 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28609238 is about 5348.7604171434. The cubic root of 28609238 is about 305.8455013427.

The spelling of 28609238 in words is "twenty-eight million, six hundred nine thousand, two hundred thirty-eight".