28091043 has 12 divisors (see below), whose sum is σ = 42079128. Its totient is φ = 18727200.

The previous prime is 28090999. The next prime is 28091071. The reversal of 28091043 is 34019082.

It is not a de Polignac number, because 28091043 - 2¹⁶ = 28025507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28090998 and 28091016.

It is not an unprimeable number, because it can be changed into a prime (28091093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57558 + ... + 58043.

It is an arithmetic number, because the mean of its divisors is an integer number (3506594).

Almost surely, 2^28091043 is an apocalyptic number.

28091043 is a deficient number, since it is larger than the sum of its proper divisors (13988085).

28091043 is an equidigital number, since it uses as much as digits as its factorization.

28091043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115616 (or 115604 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28091043 is about 5300.0983953131. The cubic root of 28091043 is about 303.9876603659.

The spelling of 28091043 in words is "twenty-eight million, ninety-one thousand, forty-three".