28813243 has 4 divisors (see below), whose sum is σ = 28826560. Its totient is φ = 28799928.

The previous prime is 28813241. The next prime is 28813261. The reversal of 28813243 is 34231882.

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

It is a cyclic number.

It is not a de Polignac number, because 28813243 - 2¹ = 28813241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28813241) 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, 2580 + ... + 8017.

It is an arithmetic number, because the mean of its divisors is an integer number (7206640).

Almost surely, 2^28813243 is an apocalyptic number.

28813243 is a deficient number, since it is larger than the sum of its proper divisors (13317).

28813243 is a wasteful number, since it uses less digits than its factorization.

28813243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13316.

The product of its digits is 9216, while the sum is 31.

The square root of 28813243 is about 5367.7968478697. The cubic root of 28813243 is about 306.5707483312.

It can be divided in two parts, 288 and 13243, that added together give a palindrome (13531).

The spelling of 28813243 in words is "twenty-eight million, eight hundred thirteen thousand, two hundred forty-three".