28238717 has 12 divisors (see below), whose sum is σ = 32380020. Its totient is φ = 24530688.

The previous prime is 28238701. The next prime is 28238719. The reversal of 28238717 is 71783282.

It can be written as a sum of positive squares in 6 ways, for example, as 121 + 28238596 = 11^2 + 5314^2 .

It is not a de Polignac number, because 28238717 - 2⁴ = 28238701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28238719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2042 + ... + 7787.

It is an arithmetic number, because the mean of its divisors is an integer number (2698335).

Almost surely, 2^28238717 is an apocalyptic number.

It is an amenable number.

28238717 is a deficient number, since it is larger than the sum of its proper divisors (4141303).

28238717 is a wasteful number, since it uses less digits than its factorization.

28238717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9872 (or 9859 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The square root of 28238717 is about 5314.0113850085. The cubic root of 28238717 is about 304.5194151427.

The spelling of 28238717 in words is "twenty-eight million, two hundred thirty-eight thousand, seven hundred seventeen".