28725 has 12 divisors (see below), whose sum is σ = 47616. Its totient is φ = 15280.

The previous prime is 28723. The next prime is 28729. The reversal of 28725 is 52782.

It is not a de Polignac number, because 28725 - 2¹ = 28723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28695 and 28704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28723) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 117 + ... + 266.

It is an arithmetic number, because the mean of its divisors is an integer number (3968).

2²⁸⁷²⁵ is an apocalyptic number.

28725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28725 is a deficient number, since it is larger than the sum of its proper divisors (18891).

28725 is a wasteful number, since it uses less digits than its factorization.

28725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 391 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 28725 is about 169.4845125668. The cubic root of 28725 is about 30.6257461987.

The spelling of 28725 in words is "twenty-eight thousand, seven hundred twenty-five".