28357442 has 8 divisors (see below), whose sum is σ = 42695100. Its totient is φ = 14125744.

The previous prime is 28357423. The next prime is 28357453. The reversal of 28357442 is 24475382.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 7845601 = 4529^2 + 2801^2 .

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 25817 + ... + 26892.

Almost surely, 2^28357442 is an apocalyptic number.

28357442 is a deficient number, since it is larger than the sum of its proper divisors (14337658).

28357442 is a wasteful number, since it uses less digits than its factorization.

28357442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52980.

The product of its digits is 53760, while the sum is 35.

The square root of 28357442 is about 5325.1706075956. The cubic root of 28357442 is about 304.9455855627.

The spelling of 28357442 in words is "twenty-eight million, three hundred fifty-seven thousand, four hundred forty-two".