28152811 has 4 divisors (see below), whose sum is σ = 28165824. Its totient is φ = 28139800.

The previous prime is 28152793. The next prime is 28152829. The reversal of 28152811 is 11825182.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28152793) and next prime (28152829).

It is a cyclic number.

It is not a de Polignac number, because 28152811 - 2⁵ = 28152779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28152811.

It is not an unprimeable number, because it can be changed into a prime (28152211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2395 + ... + 7876.

It is an arithmetic number, because the mean of its divisors is an integer number (7041456).

Almost surely, 2^28152811 is an apocalyptic number.

28152811 is a deficient number, since it is larger than the sum of its proper divisors (13013).

28152811 is a wasteful number, since it uses less digits than its factorization.

28152811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13012.

The product of its digits is 1280, while the sum is 28.

The square root of 28152811 is about 5305.9222572518. The cubic root of 28152811 is about 304.2103050502.

Adding to 28152811 its reverse (11825182), we get a palindrome (39977993).

The spelling of 28152811 in words is "twenty-eight million, one hundred fifty-two thousand, eight hundred eleven".