28081486181 has 16 divisors (see below), whose sum is σ = 32365928448. Its totient is φ = 23866110000.

The previous prime is 28081486141. The next prime is 28081486211. The reversal of 28081486181 is 18168418082.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28081486181 is a prime.

It is a super-2 number, since 2×28081486181² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081486141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355976 + ... + 427646.

It is an arithmetic number, because the mean of its divisors is an integer number (2022870528).

Almost surely, 2^28081486181 is an apocalyptic number.

It is an amenable number.

28081486181 is a deficient number, since it is larger than the sum of its proper divisors (4284442267).

28081486181 is a wasteful number, since it uses less digits than its factorization.

28081486181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72152.

The product of its (nonzero) digits is 196608, while the sum is 47.

The spelling of 28081486181 in words is "twenty-eight billion, eighty-one million, four hundred eighty-six thousand, one hundred eighty-one".