28173247 has 2 divisors, whose sum is σ = 28173248. Its totient is φ = 28173246.

The previous prime is 28173241. The next prime is 28173251. The reversal of 28173247 is 74237182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28173247 - 2¹⁵ = 28140479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28173241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086623 + 14086624.

It is an arithmetic number, because the mean of its divisors is an integer number (14086624).

Almost surely, 2^28173247 is an apocalyptic number.

28173247 is a deficient number, since it is larger than the sum of its proper divisors (1).

28173247 is an equidigital number, since it uses as much as digits as its factorization.

28173247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 34.

The square root of 28173247 is about 5307.8476805575. The cubic root of 28173247 is about 304.2838955482.

The spelling of 28173247 in words is "twenty-eight million, one hundred seventy-three thousand, two hundred forty-seven".