28320773427 has 6 divisors (see below), whose sum is σ = 40907783852. Its totient is φ = 18880515612.

The previous prime is 28320773423. The next prime is 28320773449. The reversal of 28320773427 is 72437702382.

28320773427 is a `hidden beast` number, since 283 + 20 + 7 + 7 + 342 + 7 = 666.

It is not a de Polignac number, because 28320773427 - 2² = 28320773423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28320773423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1573376293 + ... + 1573376310.

Almost surely, 2^28320773427 is an apocalyptic number.

28320773427 is a deficient number, since it is larger than the sum of its proper divisors (12587010425).

28320773427 is a wasteful number, since it uses less digits than its factorization.

28320773427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146752609 (or 3146752606 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 45.

The spelling of 28320773427 in words is "twenty-eight billion, three hundred twenty million, seven hundred seventy-three thousand, four hundred twenty-seven".