28317913 has 16 divisors (see below), whose sum is σ = 31658256. Its totient is φ = 25159680.

The previous prime is 28317907. The next prime is 28317917. The reversal of 28317913 is 31971382.

It can be written as a sum of positive squares in 8 ways, for example, as 4376464 + 23941449 = 2092^2 + 4893^2 .

It is not a de Polignac number, because 28317913 - 2⁵ = 28317881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28317917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54093 + ... + 54613.

It is an arithmetic number, because the mean of its divisors is an integer number (1978641).

Almost surely, 2^28317913 is an apocalyptic number.

It is an amenable number.

28317913 is a deficient number, since it is larger than the sum of its proper divisors (3340343).

28317913 is a wasteful number, since it uses less digits than its factorization.

28317913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 9072, while the sum is 34.

The square root of 28317913 is about 5321.4577889898. The cubic root of 28317913 is about 304.8038261920.

The spelling of 28317913 in words is "twenty-eight million, three hundred seventeen thousand, nine hundred thirteen".