28030081 has 4 divisors (see below), whose sum is σ = 28080432. Its totient is φ = 27979732.

The previous prime is 28030061. The next prime is 28030099. The reversal of 28030081 is 18003082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28030081 - 2⁹ = 28029569 is a prime.

It is a super-2 number, since 2×28030081² = 1571370881733122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28030061) 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, 24331 + ... + 25456.

It is an arithmetic number, because the mean of its divisors is an integer number (7020108).

Almost surely, 2^28030081 is an apocalyptic number.

It is an amenable number.

28030081 is a deficient number, since it is larger than the sum of its proper divisors (50351).

28030081 is an equidigital number, since it uses as much as digits as its factorization.

28030081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50350.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28030081 is about 5294.3442464577. The cubic root of 28030081 is about 303.7676006894.

The spelling of 28030081 in words is "twenty-eight million, thirty thousand, eighty-one".