28938517 has 2 divisors, whose sum is σ = 28938518. Its totient is φ = 28938516.

The previous prime is 28938451. The next prime is 28938529. The reversal of 28938517 is 71583982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28579716 + 358801 = 5346^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 28938517 - 2²³ = 20549909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28438517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14469258 + 14469259.

It is an arithmetic number, because the mean of its divisors is an integer number (14469259).

Almost surely, 2^28938517 is an apocalyptic number.

It is an amenable number.

28938517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28938517 is an equidigital number, since it uses as much as digits as its factorization.

28938517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 28938517 is about 5379.4532250034. The cubic root of 28938517 is about 307.0144079647.

The spelling of 28938517 in words is "twenty-eight million, nine hundred thirty-eight thousand, five hundred seventeen".