28789394 has 8 divisors (see below), whose sum is σ = 43292988. Its totient is φ = 14358400.

The previous prime is 28789393. The next prime is 28789429. The reversal of 28789394 is 49398782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23668225 + 5121169 = 4865^2 + 2263^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28789393) 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 in 3 ways as a sum of consecutive naturals, for example, 17147 + ... + 18750.

Almost surely, 2^28789394 is an apocalyptic number.

28789394 is a deficient number, since it is larger than the sum of its proper divisors (14503594).

28789394 is a wasteful number, since it uses less digits than its factorization.

28789394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36300.

The product of its digits is 870912, while the sum is 50.

The square root of 28789394 is about 5365.5748993002. The cubic root of 28789394 is about 306.4861411253.

The spelling of 28789394 in words is "twenty-eight million, seven hundred eighty-nine thousand, three hundred ninety-four".