28989238 has 4 divisors (see below), whose sum is σ = 43483860. Its totient is φ = 14494618.

The previous prime is 28989227. The next prime is 28989293. The reversal of 28989238 is 83298982.

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 = 28989191 and 28989200.

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, 7247308 + ... + 7247311.

It is an arithmetic number, because the mean of its divisors is an integer number (10870965).

Almost surely, 2^28989238 is an apocalyptic number.

28989238 is a deficient number, since it is larger than the sum of its proper divisors (14494622).

28989238 is a wasteful number, since it uses less digits than its factorization.

28989238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14494621.

The product of its digits is 497664, while the sum is 49.

The square root of 28989238 is about 5384.1654877985. The cubic root of 28989238 is about 307.1936729541.

The spelling of 28989238 in words is "twenty-eight million, nine hundred eighty-nine thousand, two hundred thirty-eight".