28738 has 4 divisors (see below), whose sum is σ = 43110. Its totient is φ = 14368.

The previous prime is 28729. The next prime is 28751. The reversal of 28738 is 83782.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 23409 + 5329 = 153^2 + 73^2 .

It is a d-powerful number, because it can be written as 2¹³ + 8 + 7³ + 3⁹ + 8³ .

It is a congruent number.

It is an unprimeable number.

28738 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7183 + ... + 7186.

2²⁸⁷³⁸ is an apocalyptic number.

28738 is a deficient number, since it is larger than the sum of its proper divisors (14372).

28738 is a wasteful number, since it uses less digits than its factorization.

28738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14371.

The product of its digits is 2688, while the sum is 28.

The square root of 28738 is about 169.5228598154. The cubic root of 28738 is about 30.6303655738.

It can be divided in two parts, 287 and 38, that added together give a triangular number (325 = T₂₅).

The spelling of 28738 in words is "twenty-eight thousand, seven hundred thirty-eight".