28036131 has 4 divisors (see below), whose sum is σ = 37381512. Its totient is φ = 18690752.

The previous prime is 28036117. The next prime is 28036147. The reversal of 28036131 is 13163082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28036131 - 2⁶ = 28036067 is a prime.

It is a super-2 number, since 2×28036131² = 1572049282898322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28036171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4672686 + ... + 4672691.

It is an arithmetic number, because the mean of its divisors is an integer number (9345378).

Almost surely, 2^28036131 is an apocalyptic number.

28036131 is a deficient number, since it is larger than the sum of its proper divisors (9345381).

28036131 is an equidigital number, since it uses as much as digits as its factorization.

28036131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9345380.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 28036131 is about 5294.9155800636. The cubic root of 28036131 is about 303.7894541377.

The spelling of 28036131 in words is "twenty-eight million, thirty-six thousand, one hundred thirty-one".