28886812181 has 8 divisors (see below), whose sum is σ = 29985235200. Its totient is φ = 27798801120.

The previous prime is 28886812121. The next prime is 28886812219. The reversal of 28886812181 is 18121868882.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-28886812181 is a prime.

It is a super-2 number, since 2×28886812181² (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 (28886812121) 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, 2597336 + ... + 2608433.

It is an arithmetic number, because the mean of its divisors is an integer number (3748154400).

Almost surely, 2^28886812181 is an apocalyptic number.

It is an amenable number.

28886812181 is a deficient number, since it is larger than the sum of its proper divisors (1098423019).

28886812181 is a wasteful number, since it uses less digits than its factorization.

28886812181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205979.

The product of its digits is 786432, while the sum is 53.

The spelling of 28886812181 in words is "twenty-eight billion, eight hundred eighty-six million, eight hundred twelve thousand, one hundred eighty-one".