28187733 has 16 divisors (see below), whose sum is σ = 43868160. Its totient is φ = 15764016.

The previous prime is 28187729. The next prime is 28187749. The reversal of 28187733 is 33778182.

It is not a de Polignac number, because 28187733 - 2² = 28187729 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28187691 and 28187700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187233) 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, 13293 + ... + 15266.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^28187733 is an apocalyptic number.

It is an amenable number.

28187733 is a deficient number, since it is larger than the sum of its proper divisors (15680427).

28187733 is a wasteful number, since it uses less digits than its factorization.

28187733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28616.

The product of its digits is 56448, while the sum is 39.

The square root of 28187733 is about 5309.2120884365. The cubic root of 28187733 is about 304.3360384110.

It can be divided in two parts, 28187 and 733, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28187733 in words is "twenty-eight million, one hundred eighty-seven thousand, seven hundred thirty-three".