28137247 has 2 divisors, whose sum is σ = 28137248. Its totient is φ = 28137246.

The previous prime is 28137209. The next prime is 28137259. The reversal of 28137247 is 74273182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28137247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28137847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14068623 + 14068624.

It is an arithmetic number, because the mean of its divisors is an integer number (14068624).

Almost surely, 2^28137247 is an apocalyptic number.

28137247 is a deficient number, since it is larger than the sum of its proper divisors (1).

28137247 is an equidigital number, since it uses as much as digits as its factorization.

28137247 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 28137247 is about 5304.4553914610. The cubic root of 28137247 is about 304.1542348415.

The spelling of 28137247 in words is "twenty-eight million, one hundred thirty-seven thousand, two hundred forty-seven".