28566157 has 2 divisors, whose sum is σ = 28566158. Its totient is φ = 28566156.

The previous prime is 28566143. The next prime is 28566173. The reversal of 28566157 is 75166582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15163236 + 13402921 = 3894^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 28566157 - 2¹⁵ = 28533389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28566107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14283078 + 14283079.

It is an arithmetic number, because the mean of its divisors is an integer number (14283079).

Almost surely, 2^28566157 is an apocalyptic number.

It is an amenable number.

28566157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28566157 is an equidigital number, since it uses as much as digits as its factorization.

28566157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 28566157 is about 5344.7317051467. The cubic root of 28566157 is about 305.6919058583.

The spelling of 28566157 in words is "twenty-eight million, five hundred sixty-six thousand, one hundred fifty-seven".