28657157 has 4 divisors (see below), whose sum is σ = 28680876. Its totient is φ = 28633440.

The previous prime is 28657151. The next prime is 28657163. The reversal of 28657157 is 75175682.

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

It is an interprime number because it is at equal distance from previous prime (28657151) and next prime (28657163).

It can be written as a sum of positive squares in 2 ways, for example, as 8145316 + 20511841 = 2854^2 + 4529^2 .

It is a cyclic number.

It is not a de Polignac number, because 28657157 - 2⁴ = 28657141 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 (28657151) by changing a digit.

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, 9944 + ... + 12497.

It is an arithmetic number, because the mean of its divisors is an integer number (7170219).

Almost surely, 2^28657157 is an apocalyptic number.

It is an amenable number.

28657157 is a deficient number, since it is larger than the sum of its proper divisors (23719).

28657157 is a wasteful number, since it uses less digits than its factorization.

28657157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23718.

The product of its digits is 117600, while the sum is 41.

The square root of 28657157 is about 5353.2379920941. The cubic root of 28657157 is about 306.0161645810.

The spelling of 28657157 in words is "twenty-eight million, six hundred fifty-seven thousand, one hundred fifty-seven".