28507117 has 2 divisors, whose sum is σ = 28507118. Its totient is φ = 28507116.

The previous prime is 28507111. The next prime is 28507123. The reversal of 28507117 is 71170582.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28507111) and next prime (28507123).

It can be written as a sum of positive squares in only one way, i.e., 28079401 + 427716 = 5299^2 + 654^2 .

It is a cyclic number.

It is not a de Polignac number, because 28507117 - 2³ = 28507109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28507111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253558 + 14253559.

It is an arithmetic number, because the mean of its divisors is an integer number (14253559).

Almost surely, 2^28507117 is an apocalyptic number.

It is an amenable number.

28507117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28507117 is an equidigital number, since it uses as much as digits as its factorization.

28507117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 28507117 is about 5339.2056525292. The cubic root of 28507117 is about 305.4811611624.

Adding to 28507117 its reverse (71170582), we get a palindrome (99677699).

The spelling of 28507117 in words is "twenty-eight million, five hundred seven thousand, one hundred seventeen".