28732 has 12 divisors (see below), whose sum is σ = 54936. Its totient is φ = 13040.

The previous prime is 28729. The next prime is 28751. The reversal of 28732 is 23782.

28732 = 4⁵ + 5⁵ + ... + 7⁵.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a d-powerful number, because it can be written as 2 + 8³ + 7³ + 3⁹ + 2¹³ .

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283 + ... + 370.

It is an arithmetic number, because the mean of its divisors is an integer number (4578).

2²⁸⁷³² is an apocalyptic number.

28732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28732 is a deficient number, since it is larger than the sum of its proper divisors (26204).

28732 is a wasteful number, since it uses less digits than its factorization.

28732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 666 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 28732 is about 169.5051621633. The cubic root of 28732 is about 30.6282337277.

Subtracting from 28732 its reverse (23782), we obtain a triangular number (4950 = T₉₉).

The spelling of 28732 in words is "twenty-eight thousand, seven hundred thirty-two".