28009042 has 8 divisors (see below), whose sum is σ = 42157836. Its totient is φ = 13956432.

The previous prime is 28009019. The next prime is 28009043. The reversal of 28009042 is 24090082.

It can be written as a sum of positive squares in 2 ways, for example, as 26101881 + 1907161 = 5109^2 + 1381^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28008998 and 28009016.

It is not an unprimeable number, because it can be changed into a prime (28009043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23313 + ... + 24484.

Almost surely, 2^28009042 is an apocalyptic number.

28009042 is a deficient number, since it is larger than the sum of its proper divisors (14148794).

28009042 is a wasteful number, since it uses less digits than its factorization.

28009042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48092.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28009042 is about 5292.3569418549. The cubic root of 28009042 is about 303.6915803810.

The spelling of 28009042 in words is "twenty-eight million, nine thousand, forty-two".