28421266801 has 4 divisors (see below), whose sum is σ = 28957517172. Its totient is φ = 27885016432.

The previous prime is 28421266763. The next prime is 28421266837. The reversal of 28421266801 is 10866212482.

It is a happy number.

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 21660480625 + 6760786176 = 147175^2 + 82224^2 .

It is a cyclic number.

It is not a de Polignac number, because 28421266801 - 2¹³ = 28421258609 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28421266301) 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, 268125106 + ... + 268125211.

It is an arithmetic number, because the mean of its divisors is an integer number (7239379293).

Almost surely, 2^28421266801 is an apocalyptic number.

It is an amenable number.

28421266801 is a deficient number, since it is larger than the sum of its proper divisors (536250371).

28421266801 is an equidigital number, since it uses as much as digits as its factorization.

28421266801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536250370.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 28421266801 in words is "twenty-eight billion, four hundred twenty-one million, two hundred sixty-six thousand, eight hundred one".