28857742 has 8 divisors (see below), whose sum is σ = 43506936. Its totient is φ = 14355432.

The previous prime is 28857739. The next prime is 28857779. The reversal of 28857742 is 24775882.

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

It is a congruent number.

It is an unprimeable number.

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, 36228 + ... + 37015.

It is an arithmetic number, because the mean of its divisors is an integer number (5438367).

Almost surely, 2^28857742 is an apocalyptic number.

28857742 is a deficient number, since it is larger than the sum of its proper divisors (14649194).

28857742 is a wasteful number, since it uses less digits than its factorization.

28857742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73442.

The product of its digits is 250880, while the sum is 43.

The square root of 28857742 is about 5371.9402453862. The cubic root of 28857742 is about 306.7284891639.

The spelling of 28857742 in words is "twenty-eight million, eight hundred fifty-seven thousand, seven hundred forty-two".