28985668 has 6 divisors (see below), whose sum is σ = 50724926. Its totient is φ = 14492832.

The previous prime is 28985657. The next prime is 28985669. The reversal of 28985668 is 86658982.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 12404484 = 4072^2 + 3522^2 .

It is not an unprimeable number, because it can be changed into a prime (28985669) 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 as a sum of consecutive naturals, namely, 3623205 + ... + 3623212.

Almost surely, 2^28985668 is an apocalyptic number.

It is an amenable number.

28985668 is a deficient number, since it is larger than the sum of its proper divisors (21739258).

28985668 is a wasteful number, since it uses less digits than its factorization.

28985668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7246421 (or 7246419 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The square root of 28985668 is about 5383.8339498911. The cubic root of 28985668 is about 307.1810622232.

The spelling of 28985668 in words is "twenty-eight million, nine hundred eighty-five thousand, six hundred sixty-eight".