28788938181 has 24 divisors (see below), whose sum is σ = 42378785280. Its totient is φ = 18828909216.

The previous prime is 28788938173. The next prime is 28788938183. The reversal of 28788938181 is 18183988782.

It is not a de Polignac number, because 28788938181 - 2³ = 28788938173 is a prime.

It is a super-2 number, since 2×28788938181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788938183) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17325 + ... + 240578.

It is an arithmetic number, because the mean of its divisors is an integer number (1765782720).

Almost surely, 2^28788938181 is an apocalyptic number.

It is an amenable number.

28788938181 is a deficient number, since it is larger than the sum of its proper divisors (13589847099).

28788938181 is a wasteful number, since it uses less digits than its factorization.

28788938181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258145 (or 258142 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 63.

The spelling of 28788938181 in words is "twenty-eight billion, seven hundred eighty-eight million, nine hundred thirty-eight thousand, one hundred eighty-one".