28138033 has 16 divisors (see below), whose sum is σ = 36293760. Its totient is φ = 21168000.

The previous prime is 28138027. The next prime is 28138037. The reversal of 28138033 is 33083182.

It is not a de Polignac number, because 28138033 - 2¹³ = 28129841 is a prime.

It is a super-2 number, since 2×28138033² = 1583497802218178, 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 = 28137992 and 28138010.

It is not an unprimeable number, because it can be changed into a prime (28138037) 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 15 ways as a sum of consecutive naturals, for example, 4068 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (2268360).

Almost surely, 2^28138033 is an apocalyptic number.

It is an amenable number.

28138033 is a deficient number, since it is larger than the sum of its proper divisors (8155727).

28138033 is a wasteful number, since it uses less digits than its factorization.

28138033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12648.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28138033 is about 5304.5294796051. The cubic root of 28138033 is about 304.1570669475.

The spelling of 28138033 in words is "twenty-eight million, one hundred thirty-eight thousand, thirty-three".