28774 has 4 divisors (see below), whose sum is σ = 43164. Its totient is φ = 14386.

The previous prime is 28771. The next prime is 28789. The reversal of 28774 is 47782.

28774 = T₁₃₇ + T₁₃₈ + T₁₃₉.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771) 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 as a sum of consecutive naturals, namely, 7192 + ... + 7195.

It is an arithmetic number, because the mean of its divisors is an integer number (10791).

2²⁸⁷⁷⁴ is an apocalyptic number.

28774 is the 139-th centered triangular number.

28774 is a deficient number, since it is larger than the sum of its proper divisors (14390).

28774 is a wasteful number, since it uses less digits than its factorization.

28774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14389.

The product of its digits is 3136, while the sum is 28.

The square root of 28774 is about 169.6290069534. The cubic root of 28774 is about 30.6431504236.

It can be divided in two parts, 287 and 74, that added together give a square (361 = 19²).

The spelling of 28774 in words is "twenty-eight thousand, seven hundred seventy-four".