28874201181 has 32 divisors (see below), whose sum is σ = 46582333440. Its totient is φ = 15540755904.

The previous prime is 28874201177. The next prime is 28874201183. The reversal of 28874201181 is 18110247882.

It is not a de Polignac number, because 28874201181 - 2² = 28874201177 is a prime.

It is a super-2 number, since 2×28874201181² (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 (28874201183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140125 + ... + 278178.

It is an arithmetic number, because the mean of its divisors is an integer number (1455697920).

Almost surely, 2^28874201181 is an apocalyptic number.

28874201181 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28874201181 is a deficient number, since it is larger than the sum of its proper divisors (17708132259).

28874201181 is a wasteful number, since it uses less digits than its factorization.

28874201181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418505.

The product of its (nonzero) digits is 57344, while the sum is 42.

The spelling of 28874201181 in words is "twenty-eight billion, eight hundred seventy-four million, two hundred one thousand, one hundred eighty-one".