28791243 has 24 divisors (see below), whose sum is σ = 45641232. Its totient is φ = 17379648.

The previous prime is 28791241. The next prime is 28791247. The reversal of 28791243 is 34219782.

It is not a de Polignac number, because 28791243 - 2¹ = 28791241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28791198 and 28791207.

It is not an unprimeable number, because it can be changed into a prime (28791241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3880 + ... + 8522.

It is an arithmetic number, because the mean of its divisors is an integer number (1901718).

Almost surely, 2^28791243 is an apocalyptic number.

28791243 is a deficient number, since it is larger than the sum of its proper divisors (16849989).

28791243 is a wasteful number, since it uses less digits than its factorization.

28791243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4715 (or 4712 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28791243 is about 5365.7471986667. The cubic root of 28791243 is about 306.4927023465.

The spelling of 28791243 in words is "twenty-eight million, seven hundred ninety-one thousand, two hundred forty-three".