28254849181 has 4 divisors (see below), whose sum is σ = 30428299132. Its totient is φ = 26081399232.

The previous prime is 28254849173. The next prime is 28254849193. The reversal of 28254849181 is 18194845282.

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 10468359225 + 17786489956 = 102315^2 + 133366^2 .

It is a cyclic number.

It is not a de Polignac number, because 28254849181 - 2³ = 28254849173 is a prime.

It is a super-2 number, since 2×28254849181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28254849121) 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, 1086724956 + ... + 1086724981.

It is an arithmetic number, because the mean of its divisors is an integer number (7607074783).

Almost surely, 2^28254849181 is an apocalyptic number.

It is an amenable number.

28254849181 is a deficient number, since it is larger than the sum of its proper divisors (2173449951).

28254849181 is a wasteful number, since it uses less digits than its factorization.

28254849181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173449950.

The product of its digits is 1474560, while the sum is 52.

The spelling of 28254849181 in words is "twenty-eight billion, two hundred fifty-four million, eight hundred forty-nine thousand, one hundred eighty-one".