28661633 has 48 divisors (see below), whose sum is σ = 41112960. Its totient is φ = 19388160.

The previous prime is 28661629. The next prime is 28661641. The reversal of 28661633 is 33616682.

It is not a de Polignac number, because 28661633 - 2² = 28661629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28661593 and 28661602.

It is not an unprimeable number, because it can be changed into a prime (28661623) 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 47 ways as a sum of consecutive naturals, for example, 209141 + ... + 209277.

It is an arithmetic number, because the mean of its divisors is an integer number (856520).

Almost surely, 2^28661633 is an apocalyptic number.

It is an amenable number.

28661633 is a deficient number, since it is larger than the sum of its proper divisors (12451327).

28661633 is a wasteful number, since it uses less digits than its factorization.

28661633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 187 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 28661633 is about 5353.6560405017. The cubic root of 28661633 is about 306.0320961108.

The spelling of 28661633 in words is "twenty-eight million, six hundred sixty-one thousand, six hundred thirty-three".