28681017 has 16 divisors (see below), whose sum is σ = 39372480. Its totient is φ = 18560000.

The previous prime is 28681007. The next prime is 28681063. The reversal of 28681017 is 71018682.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28681017 - 2⁴ = 28681001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28681007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30409 + ... + 31337.

It is an arithmetic number, because the mean of its divisors is an integer number (2460780).

Almost surely, 2^28681017 is an apocalyptic number.

It is an amenable number.

28681017 is a deficient number, since it is larger than the sum of its proper divisors (10691463).

28681017 is a wasteful number, since it uses less digits than its factorization.

28681017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 28681017 is about 5355.4660861591. The cubic root of 28681017 is about 306.1010708890.

Adding to 28681017 its reverse (71018682), we get a palindrome (99699699).

The spelling of 28681017 in words is "twenty-eight million, six hundred eighty-one thousand, seventeen".