28271232 has 192 divisors, whose sum is σ = 93562560. Its totient is φ = 8110080.

The previous prime is 28271231. The next prime is 28271233. The reversal of 28271232 is 23217282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28271231) and next prime (28271233).

It is a tau number, because it is divible by the number of its divisors (192).

It is a junction number, because it is equal to n+sod(n) for n = 28271196 and 28271205.

It is not an unprimeable number, because it can be changed into a prime (28271231) 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 in 23 ways as a sum of consecutive naturals, for example, 291408 + ... + 291504.

It is an arithmetic number, because the mean of its divisors is an integer number (487305).

Almost surely, 2^28271232 is an apocalyptic number.

28271232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28271232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46781280).

28271232 is an abundant number, since it is smaller than the sum of its proper divisors (65291328).

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

28271232 is a wasteful number, since it uses less digits than its factorization.

28271232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 136 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28271232 is about 5317.0698697685. The cubic root of 28271232 is about 304.6362482472.

The spelling of 28271232 in words is "twenty-eight million, two hundred seventy-one thousand, two hundred thirty-two".