28731933 has 12 divisors (see below), whose sum is σ = 43686240. Its totient is φ = 18146376.

The previous prime is 28731931. The next prime is 28731949. The reversal of 28731933 is 33913782.

It is a happy number.

It is not a de Polignac number, because 28731933 - 2¹ = 28731931 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83841 + ... + 84182.

It is an arithmetic number, because the mean of its divisors is an integer number (3640520).

Almost surely, 2^28731933 is an apocalyptic number.

It is an amenable number.

28731933 is a deficient number, since it is larger than the sum of its proper divisors (14954307).

28731933 is a wasteful number, since it uses less digits than its factorization.

28731933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168048 (or 168045 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 28731933 is about 5360.2176261790. The cubic root of 28731933 is about 306.2820992038.

The spelling of 28731933 in words is "twenty-eight million, seven hundred thirty-one thousand, nine hundred thirty-three".