28689317 has 8 divisors (see below), whose sum is σ = 29375616. Its totient is φ = 28006272.

The previous prime is 28689289. The next prime is 28689329. The reversal of 28689317 is 71398682.

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

It is a cyclic number.

It is not a de Polignac number, because 28689317 - 2¹⁰ = 28688293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28682317) 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, 31178 + ... + 32084.

It is an arithmetic number, because the mean of its divisors is an integer number (3671952).

Almost surely, 2^28689317 is an apocalyptic number.

It is an amenable number.

28689317 is a deficient number, since it is larger than the sum of its proper divisors (686299).

28689317 is an equidigital number, since it uses as much as digits as its factorization.

28689317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627.

The product of its digits is 145152, while the sum is 44.

The square root of 28689317 is about 5356.2409393156. The cubic root of 28689317 is about 306.1305955726.

The spelling of 28689317 in words is "twenty-eight million, six hundred eighty-nine thousand, three hundred seventeen".