28887317 has 4 divisors (see below), whose sum is σ = 28916160. Its totient is φ = 28858476.

The previous prime is 28887307. The next prime is 28887337. The reversal of 28887317 is 71378882.

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 28887317 - 2⁶ = 28887253 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 (28887307) 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, 12863 + ... + 14940.

It is an arithmetic number, because the mean of its divisors is an integer number (7229040).

Almost surely, 2^28887317 is an apocalyptic number.

It is an amenable number.

28887317 is a deficient number, since it is larger than the sum of its proper divisors (28843).

28887317 is a wasteful number, since it uses less digits than its factorization.

28887317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28842.

The product of its digits is 150528, while the sum is 44.

The square root of 28887317 is about 5374.6922702607. The cubic root of 28887317 is about 306.8332374592.

The spelling of 28887317 in words is "twenty-eight million, eight hundred eighty-seven thousand, three hundred seventeen".