28135243161 has 10 divisors (see below), whose sum is σ = 42029190522. Its totient is φ = 18756828720.

The previous prime is 28135243153. The next prime is 28135243181. The reversal of 28135243161 is 16134253182.

It can be written as a sum of positive squares in only one way, i.e., 20645379225 + 7489863936 = 143685^2 + 86544^2 .

It is not a de Polignac number, because 28135243161 - 2³ = 28135243153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28135243181) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 173674260 + ... + 173674421.

Almost surely, 2^28135243161 is an apocalyptic number.

It is an amenable number.

28135243161 is a deficient number, since it is larger than the sum of its proper divisors (13893947361).

28135243161 is an equidigital number, since it uses as much as digits as its factorization.

28135243161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347348693 (or 347348684 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 28135243161 in words is "twenty-eight billion, one hundred thirty-five million, two hundred forty-three thousand, one hundred sixty-one".