28907 has 4 divisors (see below), whose sum is σ = 29256. Its totient is φ = 28560.

The previous prime is 28901. The next prime is 28909. The reversal of 28907 is 70982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 70982 = 2 ⋅35491.

It is a cyclic number.

It is not a de Polignac number, because 28907 - 2⁶ = 28843 is a prime.

It is a super-2 number, since 2×28907² = 1671229298, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28901) 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, 32 + ... + 242.

It is an arithmetic number, because the mean of its divisors is an integer number (7314).

2²⁸⁹⁰⁷ is an apocalyptic number.

28907 is a deficient number, since it is larger than the sum of its proper divisors (349).

28907 is a wasteful number, since it uses less digits than its factorization.

28907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 28907 is about 170.0205869888. The cubic root of 28907 is about 30.6902910798.

The spelling of 28907 in words is "twenty-eight thousand, nine hundred seven".