28381107 has 8 divisors (see below), whose sum is σ = 37866384. Its totient is φ = 18908288.

The previous prime is 28381099. The next prime is 28381127. The reversal of 28381107 is 70118382.

It is a happy number.

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 28381107 - 2³ = 28381099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28381127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6103 + ... + 9695.

It is an arithmetic number, because the mean of its divisors is an integer number (4733298).

Almost surely, 2^28381107 is an apocalyptic number.

28381107 is a deficient number, since it is larger than the sum of its proper divisors (9485277).

28381107 is a wasteful number, since it uses less digits than its factorization.

28381107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 28381107 is about 5327.3921387486. The cubic root of 28381107 is about 305.0303902353.

Adding to 28381107 its reverse (70118382), we get a palindrome (98499489).

The spelling of 28381107 in words is "twenty-eight million, three hundred eighty-one thousand, one hundred seven".