28666334401 has 4 divisors (see below), whose sum is σ = 28744444672. Its totient is φ = 28588224132.

The previous prime is 28666334261. The next prime is 28666334407. The reversal of 28666334401 is 10443366682.

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 28666334401 - 2¹¹ = 28666332353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28666334407) 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, 39054585 + ... + 39055318.

It is an arithmetic number, because the mean of its divisors is an integer number (7186111168).

Almost surely, 2^28666334401 is an apocalyptic number.

It is an amenable number.

28666334401 is a deficient number, since it is larger than the sum of its proper divisors (78110271).

28666334401 is an equidigital number, since it uses as much as digits as its factorization.

28666334401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78110270.

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 28666334401 in words is "twenty-eight billion, six hundred sixty-six million, three hundred thirty-four thousand, four hundred one".