28663312 has 10 divisors (see below), whose sum is σ = 55535198. Its totient is φ = 14331648.

The previous prime is 28663289. The next prime is 28663319. The reversal of 28663312 is 21336682.

It can be written as a sum of positive squares in only one way, i.e., 28558336 + 104976 = 5344^2 + 324^2 .

It is not an unprimeable number, because it can be changed into a prime (28663319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895713 + ... + 895744.

Almost surely, 2^28663312 is an apocalyptic number.

It is an amenable number.

28663312 is a deficient number, since it is larger than the sum of its proper divisors (26871886).

28663312 is a wasteful number, since it uses less digits than its factorization.

28663312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791465 (or 1791459 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 28663312 is about 5353.8128469344. The cubic root of 28663312 is about 306.0380717863.

Adding to 28663312 its reverse (21336682), we get a palindrome (49999994).

The spelling of 28663312 in words is "twenty-eight million, six hundred sixty-three thousand, three hundred twelve".