28408317 has 8 divisors (see below), whose sum is σ = 43288896. Its totient is φ = 16233312.

The previous prime is 28408301. The next prime is 28408319. The reversal of 28408317 is 71380482.

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

It is not a de Polignac number, because 28408317 - 2⁴ = 28408301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28408319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676368 + ... + 676409.

It is an arithmetic number, because the mean of its divisors is an integer number (5411112).

Almost surely, 2^28408317 is an apocalyptic number.

It is an amenable number.

28408317 is a deficient number, since it is larger than the sum of its proper divisors (14880579).

28408317 is a wasteful number, since it uses less digits than its factorization.

28408317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352787.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28408317 is about 5329.9453092879. The cubic root of 28408317 is about 305.1278403437.

Adding to 28408317 its reverse (71380482), we get a palindrome (99788799).

The spelling of 28408317 in words is "twenty-eight million, four hundred eight thousand, three hundred seventeen".