28182943 has 4 divisors (see below), whose sum is σ = 28660680. Its totient is φ = 27705208.

The previous prime is 28182893. The next prime is 28182961. The reversal of 28182943 is 34928182.

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 28182943 - 2⁹ = 28182431 is a prime.

It is a super-2 number, since 2×28182943² = 1588556552282498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28182743) 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, 238780 + ... + 238897.

It is an arithmetic number, because the mean of its divisors is an integer number (7165170).

Almost surely, 2^28182943 is an apocalyptic number.

28182943 is a deficient number, since it is larger than the sum of its proper divisors (477737).

28182943 is an equidigital number, since it uses as much as digits as its factorization.

28182943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477736.

The product of its digits is 27648, while the sum is 37.

The square root of 28182943 is about 5308.7609665533. The cubic root of 28182943 is about 304.3187986161.

The spelling of 28182943 in words is "twenty-eight million, one hundred eighty-two thousand, nine hundred forty-three".