28033641 has 16 divisors (see below), whose sum is σ = 42872320. Its totient is φ = 18085680.

The previous prime is 28033639. The next prime is 28033651. The reversal of 28033641 is 14633082.

It is a happy number.

It is not a de Polignac number, because 28033641 - 2¹ = 28033639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28033631) 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, 15910 + ... + 17583.

It is an arithmetic number, because the mean of its divisors is an integer number (2679520).

Almost surely, 2^28033641 is an apocalyptic number.

It is an amenable number.

28033641 is a deficient number, since it is larger than the sum of its proper divisors (14838679).

28033641 is a wasteful number, since it uses less digits than its factorization.

28033641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33533 (or 33527 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28033641 is about 5294.6804436151. The cubic root of 28033641 is about 303.7804602893.

The spelling of 28033641 in words is "twenty-eight million, thirty-three thousand, six hundred forty-one".