28693312 has 28 divisors (see below), whose sum is σ = 58155840. Its totient is φ = 14039936.

The previous prime is 28693309. The next prime is 28693319. The reversal of 28693312 is 21339682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28693319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762 + ... + 7777.

Almost surely, 2^28693312 is an apocalyptic number.

It is an amenable number.

28693312 is an abundant number, since it is smaller than the sum of its proper divisors (29462528).

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

28693312 is an equidigital number, since it uses as much as digits as its factorization.

28693312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9598 (or 9588 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 28693312 is about 5356.6138557861. The cubic root of 28693312 is about 306.1448045197.

The spelling of 28693312 in words is "twenty-eight million, six hundred ninety-three thousand, three hundred twelve".