28113917 has 8 divisors (see below), whose sum is σ = 30318456. Its totient is φ = 25915392.

The previous prime is 28113893. The next prime is 28113923. The reversal of 28113917 is 71931182.

It can be written as a sum of positive squares in 4 ways, for example, as 383161 + 27730756 = 619^2 + 5266^2 .

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 28113917 - 2⁶ = 28113853 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 (28013917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14933 + ... + 16709.

It is an arithmetic number, because the mean of its divisors is an integer number (3789807).

Almost surely, 2^28113917 is an apocalyptic number.

It is an amenable number.

28113917 is a deficient number, since it is larger than the sum of its proper divisors (2204539).

28113917 is a wasteful number, since it uses less digits than its factorization.

28113917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007.

The product of its digits is 3024, while the sum is 32.

The square root of 28113917 is about 5302.2558406776. The cubic root of 28113917 is about 304.0701484299.

The spelling of 28113917 in words is "twenty-eight million, one hundred thirteen thousand, nine hundred seventeen".