28419394 has 4 divisors (see below), whose sum is σ = 42629094. Its totient is φ = 14209696.

The previous prime is 28419373. The next prime is 28419397. The reversal of 28419394 is 49391482.

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., 26388769 + 2030625 = 5137^2 + 1425^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28419397) 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, 7104847 + ... + 7104850.

Almost surely, 2^28419394 is an apocalyptic number.

28419394 is a deficient number, since it is larger than the sum of its proper divisors (14209700).

28419394 is a wasteful number, since it uses less digits than its factorization.

28419394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14209699.

The product of its digits is 62208, while the sum is 40.

The square root of 28419394 is about 5330.9843368744. The cubic root of 28419394 is about 305.1674937767.

The spelling of 28419394 in words is "twenty-eight million, four hundred nineteen thousand, three hundred ninety-four".