28061137 has 4 divisors (see below), whose sum is σ = 30219700. Its totient is φ = 25902576.

The previous prime is 28061123. The next prime is 28061161. The reversal of 28061137 is 73116082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3101121 + 24960016 = 1761^2 + 4996^2 .

It is a cyclic number.

It is not a de Polignac number, because 28061137 - 2¹¹ = 28059089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28061437) 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, 1079262 + ... + 1079287.

It is an arithmetic number, because the mean of its divisors is an integer number (7554925).

Almost surely, 2^28061137 is an apocalyptic number.

It is an amenable number.

28061137 is a deficient number, since it is larger than the sum of its proper divisors (2158563).

28061137 is a wasteful number, since it uses less digits than its factorization.

28061137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158562.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 28061137 is about 5297.2763756482. The cubic root of 28061137 is about 303.8797459793.

The spelling of 28061137 in words is "twenty-eight million, sixty-one thousand, one hundred thirty-seven".