28246374881 has 4 divisors (see below), whose sum is σ = 28250298132. Its totient is φ = 28242451632.

The previous prime is 28246374829. The next prime is 28246374899. The reversal of 28246374881 is 18847364282.

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 13729980625 + 14516394256 = 117175^2 + 120484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28246374881 is a prime.

It is a super-2 number, since 2×28246374881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28246379881) 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, 1950806 + ... + 1965231.

It is an arithmetic number, because the mean of its divisors is an integer number (7062574533).

Almost surely, 2^28246374881 is an apocalyptic number.

It is an amenable number.

28246374881 is a deficient number, since it is larger than the sum of its proper divisors (3923251).

28246374881 is an equidigital number, since it uses as much as digits as its factorization.

28246374881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923250.

The product of its digits is 4128768, while the sum is 53.

The spelling of 28246374881 in words is "twenty-eight billion, two hundred forty-six million, three hundred seventy-four thousand, eight hundred eighty-one".