28128338 has 8 divisors (see below), whose sum is σ = 48220032. Its totient is φ = 12054996.

The previous prime is 28128329. The next prime is 28128343. The reversal of 28128338 is 83382182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28128298 and 28128307.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004570 + ... + 1004597.

It is an arithmetic number, because the mean of its divisors is an integer number (6027504).

Almost surely, 2^28128338 is an apocalyptic number.

28128338 is a deficient number, since it is larger than the sum of its proper divisors (20091694).

28128338 is a wasteful number, since it uses less digits than its factorization.

28128338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009176.

The product of its digits is 18432, while the sum is 35.

The square root of 28128338 is about 5303.6155592200. The cubic root of 28128338 is about 304.1221303488.

The spelling of 28128338 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred thirty-eight".