28783243 has 4 divisors (see below), whose sum is σ = 29177608. Its totient is φ = 28388880.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783243 is 34238782.

It is a happy number.

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 28783243 - 2²¹ = 26686091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28783943) 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, 197073 + ... + 197218.

It is an arithmetic number, because the mean of its divisors is an integer number (7294402).

Almost surely, 2^28783243 is an apocalyptic number.

28783243 is a deficient number, since it is larger than the sum of its proper divisors (394365).

28783243 is an equidigital number, since it uses as much as digits as its factorization.

28783243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394364.

The product of its digits is 64512, while the sum is 37.

The square root of 28783243 is about 5365.0016775393. The cubic root of 28783243 is about 306.4643121313.

The spelling of 28783243 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred forty-three".