28646 has 4 divisors (see below), whose sum is σ = 42972. Its totient is φ = 14322.

The previous prime is 28643. The next prime is 28649. The reversal of 28646 is 64682.

28646 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64682 = 2 ⋅32341.

It is an interprime number because it is at equal distance from previous prime (28643) and next prime (28649).

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7160 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (10743).

2²⁸⁶⁴⁶ is an apocalyptic number.

28646 is a deficient number, since it is larger than the sum of its proper divisors (14326).

28646 is a wasteful number, since it uses less digits than its factorization.

28646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14325.

The product of its digits is 2304, while the sum is 26.

The square root of 28646 is about 169.2512924618. The cubic root of 28646 is about 30.5976445992.

The spelling of 28646 in words is "twenty-eight thousand, six hundred forty-six".