28185031 has 16 divisors (see below), whose sum is σ = 34283520. Its totient is φ = 22619520.

The previous prime is 28185019. The next prime is 28185061. The reversal of 28185031 is 13058182.

It is not a de Polignac number, because 28185031 - 2⁷ = 28184903 is a prime.

It is a super-2 number, since 2×28185031² = 1588791944941922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28185011) 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, 27946 + ... + 28936.

It is an arithmetic number, because the mean of its divisors is an integer number (2142720).

Almost surely, 2^28185031 is an apocalyptic number.

28185031 is a deficient number, since it is larger than the sum of its proper divisors (6098489).

28185031 is a wasteful number, since it uses less digits than its factorization.

28185031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28185031 is about 5308.9576189682. The cubic root of 28185031 is about 304.3263138232.

The spelling of 28185031 in words is "twenty-eight million, one hundred eighty-five thousand, thirty-one".