28801105 has 8 divisors (see below), whose sum is σ = 34641000. Its totient is φ = 22987776.

The previous prime is 28801063. The next prime is 28801117. The reversal of 28801105 is 50110882.

It can be written as a sum of positive squares in 4 ways, for example, as 7354944 + 21446161 = 2712^2 + 4631^2 .

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 28801105 - 2⁷ = 28800977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28801105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4170 + ... + 8659.

It is an arithmetic number, because the mean of its divisors is an integer number (4330125).

Almost surely, 2^28801105 is an apocalyptic number.

It is an amenable number.

28801105 is a deficient number, since it is larger than the sum of its proper divisors (5839895).

28801105 is a wasteful number, since it uses less digits than its factorization.

28801105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13283.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 28801105 is about 5366.6660973085. Note that the first 3 decimals coincide. The cubic root of 28801105 is about 306.5276931477.

Adding to 28801105 its reverse (50110882), we get a palindrome (78911987).

The spelling of 28801105 in words is "twenty-eight million, eight hundred one thousand, one hundred five".