28030306091 has 4 divisors (see below), whose sum is σ = 28996868400. Its totient is φ = 27063743784.

The previous prime is 28030306009. The next prime is 28030306093. The reversal of 28030306091 is 19060303082.

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 28030306091 - 2¹⁰ = 28030305067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28030306093) 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, 483281111 + ... + 483281168.

It is an arithmetic number, because the mean of its divisors is an integer number (7249217100).

Almost surely, 2^28030306091 is an apocalyptic number.

28030306091 is a deficient number, since it is larger than the sum of its proper divisors (966562309).

28030306091 is an equidigital number, since it uses as much as digits as its factorization.

28030306091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966562308.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 28030306091 in words is "twenty-eight billion, thirty million, three hundred six thousand, ninety-one".