28281633 has 16 divisors (see below), whose sum is σ = 39840000. Its totient is φ = 17796240.

The previous prime is 28281629. The next prime is 28281679. The reversal of 28281633 is 33618282.

It is not a de Polignac number, because 28281633 - 2² = 28281629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28281594 and 28281603.

It is not an unprimeable number, because it can be changed into a prime (28281623) 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, 18118 + ... + 19616.

It is an arithmetic number, because the mean of its divisors is an integer number (2490000).

Almost surely, 2^28281633 is an apocalyptic number.

It is an amenable number.

28281633 is a deficient number, since it is larger than the sum of its proper divisors (11558367).

28281633 is a wasteful number, since it uses less digits than its factorization.

28281633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852.

The product of its digits is 13824, while the sum is 33.

The square root of 28281633 is about 5318.0478561216. The cubic root of 28281633 is about 304.6736022747.

The spelling of 28281633 in words is "twenty-eight million, two hundred eighty-one thousand, six hundred thirty-three".