28544138 has 8 divisors (see below), whose sum is σ = 48932832. Its totient is φ = 12233196.

The previous prime is 28544129. The next prime is 28544143. The reversal of 28544138 is 83144582.

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 = 28544098 and 28544107.

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, 1019420 + ... + 1019447.

It is an arithmetic number, because the mean of its divisors is an integer number (6116604).

Almost surely, 2^28544138 is an apocalyptic number.

28544138 is a deficient number, since it is larger than the sum of its proper divisors (20388694).

28544138 is a wasteful number, since it uses less digits than its factorization.

28544138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038876.

The product of its digits is 30720, while the sum is 35.

The square root of 28544138 is about 5342.6714291635. The cubic root of 28544138 is about 305.6133424933.

It can be divided in two parts, 28544 and 138, that added together give a palindrome (28682).

The spelling of 28544138 in words is "twenty-eight million, five hundred forty-four thousand, one hundred thirty-eight".