28144874 has 4 divisors (see below), whose sum is σ = 42217314. Its totient is φ = 14072436.

The previous prime is 28144873. The next prime is 28144903. The reversal of 28144874 is 47844182.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 28143025 + 1849 = 5305^2 + 43^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28144873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7036217 + ... + 7036220.

Almost surely, 2^28144874 is an apocalyptic number.

28144874 is a deficient number, since it is larger than the sum of its proper divisors (14072440).

28144874 is a wasteful number, since it uses less digits than its factorization.

28144874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14072439.

The product of its digits is 57344, while the sum is 38.

The square root of 28144874 is about 5305.1742666947. The cubic root of 28144874 is about 304.1817141322.

The spelling of 28144874 in words is "twenty-eight million, one hundred forty-four thousand, eight hundred seventy-four".