28263232 has 14 divisors (see below), whose sum is σ = 56084978. Its totient is φ = 14131584.

The previous prime is 28263229. The next prime is 28263233. The reversal of 28263232 is 23236282.

It can be written as a sum of positive squares in only one way, i.e., 27709696 + 553536 = 5264^2 + 744^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28263232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28263233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220743 + ... + 220870.

Almost surely, 2^28263232 is an apocalyptic number.

It is an amenable number.

28263232 is a deficient number, since it is larger than the sum of its proper divisors (27821746).

28263232 is an equidigital number, since it uses as much as digits as its factorization.

28263232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441625 (or 441615 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 28263232 is about 5316.3175224962. The cubic root of 28263232 is about 304.6075109086.

The spelling of 28263232 in words is "twenty-eight million, two hundred sixty-three thousand, two hundred thirty-two".