28011712 has 28 divisors (see below), whose sum is σ = 55768240. Its totient is φ = 13959936.

The previous prime is 28011707. The next prime is 28011721. The reversal of 28011712 is 21711082.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27598 + ... + 28594.

Almost surely, 2^28011712 is an apocalyptic number.

It is an amenable number.

28011712 is a deficient number, since it is larger than the sum of its proper divisors (27756528).

28011712 is an equidigital number, since it uses as much as digits as its factorization.

28011712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448 (or 1438 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 28011712 is about 5292.6091864032. The cubic root of 28011712 is about 303.7012300119.

Adding to 28011712 its reverse (21711082), we get a palindrome (49722794).

The spelling of 28011712 in words is "twenty-eight million, eleven thousand, seven hundred twelve".