28954312181 has 8 divisors (see below), whose sum is σ = 29787039360. Its totient is φ = 28132193232.

The previous prime is 28954312169. The next prime is 28954312183. The reversal of 28954312181 is 18121345982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28954312181 - 2²² = 28950117877 is a prime.

It is a super-2 number, since 2×28954312181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28954312183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2646521 + ... + 2657438.

It is an arithmetic number, because the mean of its divisors is an integer number (3723379920).

Almost surely, 2^28954312181 is an apocalyptic number.

It is an amenable number.

28954312181 is a deficient number, since it is larger than the sum of its proper divisors (832727179).

28954312181 is a wasteful number, since it uses less digits than its factorization.

28954312181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304115.

The product of its digits is 138240, while the sum is 44.

The spelling of 28954312181 in words is "twenty-eight billion, nine hundred fifty-four million, three hundred twelve thousand, one hundred eighty-one".