28731732 has 24 divisors (see below), whose sum is σ = 68141472. Its totient is φ = 9420000.

The previous prime is 28731727. The next prime is 28731733. The reversal of 28731732 is 23713782.

It is a junction number, because it is equal to n+sod(n) for n = 28731693 and 28731702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731733) 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 7 ways as a sum of consecutive naturals, for example, 18894 + ... + 20357.

It is an arithmetic number, because the mean of its divisors is an integer number (2839228).

Almost surely, 2^28731732 is an apocalyptic number.

It is an amenable number.

28731732 is an abundant number, since it is smaller than the sum of its proper divisors (39409740).

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

28731732 is a wasteful number, since it uses less digits than its factorization.

28731732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39319 (or 39317 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 28731732 is about 5360.1988769075. The cubic root of 28731732 is about 306.2813849829.

The spelling of 28731732 in words is "twenty-eight million, seven hundred thirty-one thousand, seven hundred thirty-two".