28861317 has 6 divisors (see below), whose sum is σ = 41688582. Its totient is φ = 19240872.

The previous prime is 28861303. The next prime is 28861319. The reversal of 28861317 is 71316882.

28861317 is a `hidden beast` number, since 28 + 8 + 613 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21538881 + 7322436 = 4641^2 + 2706^2 .

It is not a de Polignac number, because 28861317 - 2¹⁸ = 28599173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1603398 + ... + 1603415.

It is an arithmetic number, because the mean of its divisors is an integer number (6948097).

Almost surely, 2^28861317 is an apocalyptic number.

It is an amenable number.

28861317 is a deficient number, since it is larger than the sum of its proper divisors (12827265).

28861317 is a wasteful number, since it uses less digits than its factorization.

28861317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206819 (or 3206816 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 28861317 is about 5372.2729826397. The cubic root of 28861317 is about 306.7411548472.

The spelling of 28861317 in words is "twenty-eight million, eight hundred sixty-one thousand, three hundred seventeen".