28947232 has 12 divisors (see below), whose sum is σ = 56989926. Its totient is φ = 14473600.

The previous prime is 28947181. The next prime is 28947251. The reversal of 28947232 is 23274982.

It can be written as a sum of positive squares in only one way, i.e., 26998416 + 1948816 = 5196^2 + 1396^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28947191 and 28947200.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452269 + ... + 452332.

Almost surely, 2^28947232 is an apocalyptic number.

It is an amenable number.

28947232 is a deficient number, since it is larger than the sum of its proper divisors (28042694).

28947232 is an equidigital number, since it uses as much as digits as its factorization.

28947232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904611 (or 904603 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 28947232 is about 5380.2631905884. The cubic root of 28947232 is about 307.0452245867.

The spelling of 28947232 in words is "twenty-eight million, nine hundred forty-seven thousand, two hundred thirty-two".