28744234 has 4 divisors (see below), whose sum is σ = 43116354. Its totient is φ = 14372116.

The previous prime is 28744231. The next prime is 28744259. The reversal of 28744234 is 43244782.

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., 23668225 + 5076009 = 4865^2 + 2253^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28744234.

It is not an unprimeable number, because it can be changed into a prime (28744231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7186057 + ... + 7186060.

Almost surely, 2^28744234 is an apocalyptic number.

28744234 is a deficient number, since it is larger than the sum of its proper divisors (14372120).

28744234 is a wasteful number, since it uses less digits than its factorization.

28744234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14372119.

The product of its digits is 43008, while the sum is 34.

The square root of 28744234 is about 5361.3649381477. The cubic root of 28744234 is about 306.3258024771.

It can be divided in two parts, 287 and 44234, that added together give a square (44521 = 211²).

The spelling of 28744234 in words is "twenty-eight million, seven hundred forty-four thousand, two hundred thirty-four".