28815017 has 16 divisors (see below), whose sum is σ = 38040192. Its totient is φ = 21131520.

The previous prime is 28814969. The next prime is 28815029. The reversal of 28815017 is 71051882.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28815017 - 2⁶ = 28814953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28818017) 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, 9698 + ... + 12315.

It is an arithmetic number, because the mean of its divisors is an integer number (2377512).

Almost surely, 2^28815017 is an apocalyptic number.

It is an amenable number.

28815017 is a deficient number, since it is larger than the sum of its proper divisors (9225175).

28815017 is a wasteful number, since it uses less digits than its factorization.

28815017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22048.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 28815017 is about 5367.9620900301. The cubic root of 28815017 is about 306.5770399445.

Adding to 28815017 its reverse (71051882), we get a palindrome (99866899).

The spelling of 28815017 in words is "twenty-eight million, eight hundred fifteen thousand, seventeen".