28613217 has 8 divisors (see below), whose sum is σ = 39381760. Its totient is φ = 18460080.

The previous prime is 28613201. The next prime is 28613237. The reversal of 28613217 is 71231682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28613217 - 2⁴ = 28613201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28613237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153742 + ... + 153927.

It is an arithmetic number, because the mean of its divisors is an integer number (4922720).

Almost surely, 2^28613217 is an apocalyptic number.

It is an amenable number.

28613217 is a deficient number, since it is larger than the sum of its proper divisors (10768543).

28613217 is a wasteful number, since it uses less digits than its factorization.

28613217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307703.

The product of its digits is 4032, while the sum is 30.

The square root of 28613217 is about 5349.1323595514. The cubic root of 28613217 is about 305.8596797797.

Adding to 28613217 its reverse (71231682), we get a palindrome (99844899).

The spelling of 28613217 in words is "twenty-eight million, six hundred thirteen thousand, two hundred seventeen".