28474919181 has 6 divisors (see below), whose sum is σ = 41130438830. Its totient is φ = 18983279448.

The previous prime is 28474919167. The next prime is 28474919201. The reversal of 28474919181 is 18191947482.

28474919181 is a `hidden beast` number, since 2 + 8 + 474 + 9 + 1 + 91 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23757289956 + 4717629225 = 154134^2 + 68685^2 .

It is not a de Polignac number, because 28474919181 - 2⁹ = 28474918669 is a prime.

It is a super-2 number, since 2×28474919181² (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 (28474919581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1581939946 + ... + 1581939963.

Almost surely, 2^28474919181 is an apocalyptic number.

It is an amenable number.

28474919181 is a deficient number, since it is larger than the sum of its proper divisors (12655519649).

28474919181 is a wasteful number, since it uses less digits than its factorization.

28474919181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163879915 (or 3163879912 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 28474919181 in words is "twenty-eight billion, four hundred seventy-four million, nine hundred nineteen thousand, one hundred eighty-one".