28785238 has 4 divisors (see below), whose sum is σ = 43177860. Its totient is φ = 14392618.

The previous prime is 28785221. The next prime is 28785257. The reversal of 28785238 is 83258782.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 28785194 and 28785203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7196308 + ... + 7196311.

It is an arithmetic number, because the mean of its divisors is an integer number (10794465).

Almost surely, 2^28785238 is an apocalyptic number.

28785238 is a deficient number, since it is larger than the sum of its proper divisors (14392622).

28785238 is a wasteful number, since it uses less digits than its factorization.

28785238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14392621.

The product of its digits is 215040, while the sum is 43.

The square root of 28785238 is about 5365.1876015662. The cubic root of 28785238 is about 306.4713924335.

The spelling of 28785238 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred thirty-eight".