28157727 has 16 divisors (see below), whose sum is σ = 42190848. Its totient is φ = 16573920.

The previous prime is 28157719. The next prime is 28157737. The reversal of 28157727 is 72775182.

It is not a de Polignac number, because 28157727 - 2³ = 28157719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14799 + ... + 16592.

It is an arithmetic number, because the mean of its divisors is an integer number (2636928).

Almost surely, 2^28157727 is an apocalyptic number.

28157727 is a deficient number, since it is larger than the sum of its proper divisors (14033121).

28157727 is a wasteful number, since it uses less digits than its factorization.

28157727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430.

The product of its digits is 54880, while the sum is 39.

The square root of 28157727 is about 5306.3854929698. The cubic root of 28157727 is about 304.2280109295.

The spelling of 28157727 in words is "twenty-eight million, one hundred fifty-seven thousand, seven hundred twenty-seven".