28639017 has 12 divisors (see below), whose sum is σ = 45128304. Its totient is φ = 17356920.

The previous prime is 28639007. The next prime is 28639021. The reversal of 28639017 is 71093682.

28639017 is a `hidden beast` number, since 2 + 8 + 639 + 0 + 17 = 666.

It is not a de Polignac number, because 28639017 - 2⁷ = 28638889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28639007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144543 + ... + 144740.

It is an arithmetic number, because the mean of its divisors is an integer number (3760692).

Almost surely, 2^28639017 is an apocalyptic number.

It is an amenable number.

28639017 is a deficient number, since it is larger than the sum of its proper divisors (16489287).

28639017 is a wasteful number, since it uses less digits than its factorization.

28639017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289300 (or 289297 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28639017 is about 5351.5434222288. The cubic root of 28639017 is about 305.9515814715.

The spelling of 28639017 in words is "twenty-eight million, six hundred thirty-nine thousand, seventeen".