28378 has 8 divisors (see below), whose sum is σ = 48672. Its totient is φ = 12156.

The previous prime is 28351. The next prime is 28387. The reversal of 28378 is 87382.

It is a happy number.

28378 is nontrivially palindromic in base 13.

It is a sphenic number, since it is the product of 3 distinct primes.

28378 is a modest number, since divided by 378 gives 28 as remainder.

It is a congruent number.

It is an unprimeable number.

28378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000 + ... + 1027.

It is an arithmetic number, because the mean of its divisors is an integer number (6084).

2²⁸³⁷⁸ is an apocalyptic number.

28378 is a deficient number, since it is larger than the sum of its proper divisors (20294).

28378 is a wasteful number, since it uses less digits than its factorization.

28378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036.

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

The square root of 28378 is about 168.4577098265. The cubic root of 28378 is about 30.5019258839.

It can be divided in two parts, 283 and 78, that added together give a square (361 = 19²).

The spelling of 28378 in words is "twenty-eight thousand, three hundred seventy-eight".