28732243 has 4 divisors (see below), whose sum is σ = 29723040. Its totient is φ = 27741448.

The previous prime is 28732219. The next prime is 28732259. The reversal of 28732243 is 34223782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28732243 is a prime.

It is a super-2 number, since 2×28732243² = 1651083575622098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28732843) 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, 495355 + ... + 495412.

It is an arithmetic number, because the mean of its divisors is an integer number (7430760).

Almost surely, 2^28732243 is an apocalyptic number.

28732243 is a deficient number, since it is larger than the sum of its proper divisors (990797).

28732243 is an equidigital number, since it uses as much as digits as its factorization.

28732243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990796.

The product of its digits is 16128, while the sum is 31.

The square root of 28732243 is about 5360.2465428374. The cubic root of 28732243 is about 306.2832007321.

The spelling of 28732243 in words is "twenty-eight million, seven hundred thirty-two thousand, two hundred forty-three".