28575517 has 2 divisors, whose sum is σ = 28575518. Its totient is φ = 28575516.

The previous prime is 28575509. The next prime is 28575541. The reversal of 28575517 is 71557582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28026436 + 549081 = 5294^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 28575517 - 2³ = 28575509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28575517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28575587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14287758 + 14287759.

It is an arithmetic number, because the mean of its divisors is an integer number (14287759).

Almost surely, 2^28575517 is an apocalyptic number.

It is an amenable number.

28575517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28575517 is an equidigital number, since it uses as much as digits as its factorization.

28575517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98000, while the sum is 40.

The square root of 28575517 is about 5345.6072620424. The cubic root of 28575517 is about 305.7252899287.

It can be divided in two parts, 28575 and 517, that added together give a palindrome (29092).

The spelling of 28575517 in words is "twenty-eight million, five hundred seventy-five thousand, five hundred seventeen".