28538438 has 8 divisors (see below), whose sum is σ = 42995280. Its totient is φ = 14206680.

The previous prime is 28538431. The next prime is 28538443. The reversal of 28538438 is 83483582.

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 = 28538395 and 28538404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28538431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30698 + ... + 31613.

It is an arithmetic number, because the mean of its divisors is an integer number (5374410).

Almost surely, 2^28538438 is an apocalyptic number.

28538438 is a deficient number, since it is larger than the sum of its proper divisors (14456842).

28538438 is a wasteful number, since it uses less digits than its factorization.

28538438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62542.

The product of its digits is 184320, while the sum is 41.

The square root of 28538438 is about 5342.1379615281. The cubic root of 28538438 is about 305.5929984210.

The spelling of 28538438 in words is "twenty-eight million, five hundred thirty-eight thousand, four hundred thirty-eight".