28206888401 has 4 divisors (see below), whose sum is σ = 28210479012. Its totient is φ = 28203297792.

The previous prime is 28206888383. The next prime is 28206888403. The reversal of 28206888401 is 10488860282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11663784001 + 16543104400 = 107999^2 + 128620^2 .

It is a cyclic number.

It is not a de Polignac number, because 28206888401 - 2¹⁰ = 28206887377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28206888403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1783496 + ... + 1799241.

It is an arithmetic number, because the mean of its divisors is an integer number (7052619753).

Almost surely, 2^28206888401 is an apocalyptic number.

It is an amenable number.

28206888401 is a deficient number, since it is larger than the sum of its proper divisors (3590611).

28206888401 is an equidigital number, since it uses as much as digits as its factorization.

28206888401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590610.

The product of its (nonzero) digits is 393216, while the sum is 47.

The spelling of 28206888401 in words is "twenty-eight billion, two hundred six million, eight hundred eighty-eight thousand, four hundred one".