28905317 has 4 divisors (see below), whose sum is σ = 33034656. Its totient is φ = 24775980.

The previous prime is 28905313. The next prime is 28905323. The reversal of 28905317 is 71350982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28905317 - 2² = 28905313 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 (28905311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064659 + ... + 2064672.

It is an arithmetic number, because the mean of its divisors is an integer number (8258664).

Almost surely, 2^28905317 is an apocalyptic number.

It is an amenable number.

28905317 is a deficient number, since it is larger than the sum of its proper divisors (4129339).

28905317 is an equidigital number, since it uses as much as digits as its factorization.

28905317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129338.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28905317 is about 5376.3665239639. The cubic root of 28905317 is about 306.8969545975.

The spelling of 28905317 in words is "twenty-eight million, nine hundred five thousand, three hundred seventeen".