28043071 has 4 divisors (see below), whose sum is σ = 32049232. Its totient is φ = 24036912.

The previous prime is 28043053. The next prime is 28043117. The reversal of 28043071 is 17034082.

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 28043071 - 2⁷ = 28042943 is a prime.

It is a super-2 number, since 2×28043071² = 1572827662222082, 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 (28043011) 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, 2003070 + ... + 2003083.

It is an arithmetic number, because the mean of its divisors is an integer number (8012308).

Almost surely, 2^28043071 is an apocalyptic number.

28043071 is a deficient number, since it is larger than the sum of its proper divisors (4006161).

28043071 is an equidigital number, since it uses as much as digits as its factorization.

28043071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006160.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 28043071 is about 5295.5708851832. The cubic root of 28043071 is about 303.8145185195.

The spelling of 28043071 in words is "twenty-eight million, forty-three thousand, seventy-one".