28185474 has 16 divisors (see below), whose sum is σ = 59338080. Its totient is φ = 8900640.

The previous prime is 28185467. The next prime is 28185503. The reversal of 28185474 is 47458182.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123507 + ... + 123734.

It is an arithmetic number, because the mean of its divisors is an integer number (3708630).

Almost surely, 2^28185474 is an apocalyptic number.

28185474 is an abundant number, since it is smaller than the sum of its proper divisors (31152606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28185474 is a wasteful number, since it uses less digits than its factorization.

28185474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247265.

The product of its digits is 71680, while the sum is 39.

The square root of 28185474 is about 5308.9993407421. Note that the first 3 decimals coincide. The cubic root of 28185474 is about 304.3279082375.

The spelling of 28185474 in words is "twenty-eight million, one hundred eighty-five thousand, four hundred seventy-four".