28101937 has 4 divisors (see below), whose sum is σ = 28380276. Its totient is φ = 27823600.

The previous prime is 28101917. The next prime is 28101943. The reversal of 28101937 is 73910182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73910182 = 2 ⋅36955091.

It can be written as a sum of positive squares in 2 ways, for example, as 24117921 + 3984016 = 4911^2 + 1996^2 .

It is a cyclic number.

It is not a de Polignac number, because 28101937 - 2⁷ = 28101809 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28101899 and 28101908.

It is not an unprimeable number, because it can be changed into a prime (28101917) 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, 139018 + ... + 139219.

It is an arithmetic number, because the mean of its divisors is an integer number (7095069).

Almost surely, 2^28101937 is an apocalyptic number.

It is an amenable number.

28101937 is a deficient number, since it is larger than the sum of its proper divisors (278339).

28101937 is a wasteful number, since it uses less digits than its factorization.

28101937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278338.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 28101937 is about 5301.1260124619. The cubic root of 28101937 is about 304.0269518175.

The spelling of 28101937 in words is "twenty-eight million, one hundred one thousand, nine hundred thirty-seven".