28357871 has 4 divisors (see below), whose sum is σ = 28638744. Its totient is φ = 28077000.

The previous prime is 28357867. The next prime is 28357883. The reversal of 28357871 is 17875382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28357871 - 2² = 28357867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28357841) 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, 140285 + ... + 140486.

It is an arithmetic number, because the mean of its divisors is an integer number (7159686).

Almost surely, 2^28357871 is an apocalyptic number.

28357871 is a deficient number, since it is larger than the sum of its proper divisors (280873).

28357871 is a wasteful number, since it uses less digits than its factorization.

28357871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280872.

The product of its digits is 94080, while the sum is 41.

The square root of 28357871 is about 5325.2108878428. The cubic root of 28357871 is about 304.9471233248.

The spelling of 28357871 in words is "twenty-eight million, three hundred fifty-seven thousand, eight hundred seventy-one".