28810869 has 8 divisors (see below), whose sum is σ = 40674240. Its totient is φ = 18077376.

The previous prime is 28810867. The next prime is 28810879. The reversal of 28810869 is 96801882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28810869 - 2¹ = 28810867 is a prime.

It is a super-2 number, since 2×28810869² = 1660132345070322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28810869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28810867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282409 + ... + 282510.

It is an arithmetic number, because the mean of its divisors is an integer number (5084280).

Almost surely, 2^28810869 is an apocalyptic number.

It is an amenable number.

28810869 is a deficient number, since it is larger than the sum of its proper divisors (11863371).

28810869 is a wasteful number, since it uses less digits than its factorization.

28810869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564939.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28810869 is about 5367.5757097595. The cubic root of 28810869 is about 306.5623283725.

The spelling of 28810869 in words is "twenty-eight million, eight hundred ten thousand, eight hundred sixty-nine".