28127131 has 4 divisors (see below), whose sum is σ = 28179664. Its totient is φ = 28074600.

The previous prime is 28127111. The next prime is 28127159. The reversal of 28127131 is 13172182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13172182 = 2 ⋅6586091.

It is a cyclic number.

It is not a de Polignac number, because 28127131 - 2¹³ = 28118939 is a prime.

It is a super-2 number, since 2×28127131² = 1582270996582322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28127096 and 28127105.

It is not an unprimeable number, because it can be changed into a prime (28127101) 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, 25455 + ... + 26536.

It is an arithmetic number, because the mean of its divisors is an integer number (7044916).

Almost surely, 2^28127131 is an apocalyptic number.

28127131 is a deficient number, since it is larger than the sum of its proper divisors (52533).

28127131 is an equidigital number, since it uses as much as digits as its factorization.

28127131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52532.

The product of its digits is 672, while the sum is 25.

The square root of 28127131 is about 5303.5017677003. The cubic root of 28127131 is about 304.1177802795.

The spelling of 28127131 in words is "twenty-eight million, one hundred twenty-seven thousand, one hundred thirty-one".