28001403181 has 4 divisors (see below), whose sum is σ = 28104729664. Its totient is φ = 27898076700.

The previous prime is 28001403161. The next prime is 28001403193. The reversal of 28001403181 is 18130410082.

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 28001403181 - 2⁹ = 28001402669 is a prime.

It is a super-2 number, since 2×28001403181² (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 (28001403161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51662835 + ... + 51663376.

It is an arithmetic number, because the mean of its divisors is an integer number (7026182416).

Almost surely, 2^28001403181 is an apocalyptic number.

It is an amenable number.

28001403181 is a deficient number, since it is larger than the sum of its proper divisors (103326483).

28001403181 is a wasteful number, since it uses less digits than its factorization.

28001403181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103326482.

The product of its (nonzero) digits is 1536, while the sum is 28.

The spelling of 28001403181 in words is "twenty-eight billion, one million, four hundred three thousand, one hundred eighty-one".