28273232 has 20 divisors (see below), whose sum is σ = 58993620. Its totient is φ = 13049088.

The previous prime is 28273211. The next prime is 28273241. The reversal of 28273232 is 23237282.

It can be written as a sum of positive squares in 2 ways, for example, as 15713296 + 12559936 = 3964^2 + 3544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28273195 and 28273204.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 67757 + ... + 68172.

It is an arithmetic number, because the mean of its divisors is an integer number (2949681).

Almost surely, 2^28273232 is an apocalyptic number.

It is an amenable number.

28273232 is an abundant number, since it is smaller than the sum of its proper divisors (30720388).

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

28273232 is a wasteful number, since it uses less digits than its factorization.

28273232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135950 (or 135944 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 28273232 is about 5317.2579399536. The cubic root of 28273232 is about 304.6434317348.

The spelling of 28273232 in words is "twenty-eight million, two hundred seventy-three thousand, two hundred thirty-two".