28968825181 has 4 divisors (see below), whose sum is σ = 29037635164. Its totient is φ = 28900015200.

The previous prime is 28968825121. The next prime is 28968825199. The reversal of 28968825181 is 18152886982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18152886982 = 2 ⋅9076443491.

It can be written as a sum of positive squares in 2 ways, for example, as 12672004900 + 16296820281 = 112570^2 + 127659^2 .

It is a cyclic number.

It is not a de Polignac number, because 28968825181 - 2²³ = 28960436573 is a prime.

It is a super-2 number, since 2×28968825181² (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 (28968825121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34404360 + ... + 34405201.

It is an arithmetic number, because the mean of its divisors is an integer number (7259408791).

Almost surely, 2^28968825181 is an apocalyptic number.

It is an amenable number.

28968825181 is a deficient number, since it is larger than the sum of its proper divisors (68809983).

28968825181 is an equidigital number, since it uses as much as digits as its factorization.

28968825181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68809982.

The product of its digits is 4423680, while the sum is 58.

The spelling of 28968825181 in words is "twenty-eight billion, nine hundred sixty-eight million, eight hundred twenty-five thousand, one hundred eighty-one".