28813917 has 16 divisors (see below), whose sum is σ = 43734528. Its totient is φ = 16703280.

The previous prime is 28813909. The next prime is 28813919. The reversal of 28813917 is 71931882.

It is not a de Polignac number, because 28813917 - 2³ = 28813909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28813919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18223 + ... + 19740.

It is an arithmetic number, because the mean of its divisors is an integer number (2733408).

Almost surely, 2^28813917 is an apocalyptic number.

It is an amenable number.

28813917 is a deficient number, since it is larger than the sum of its proper divisors (14920611).

28813917 is a wasteful number, since it uses less digits than its factorization.

28813917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38000.

The product of its digits is 24192, while the sum is 39.

The square root of 28813917 is about 5367.8596293122. The cubic root of 28813917 is about 306.5731387491.

The spelling of 28813917 in words is "twenty-eight million, eight hundred thirteen thousand, nine hundred seventeen".