28285636 has 6 divisors (see below), whose sum is σ = 49499870. Its totient is φ = 14142816.

The previous prime is 28285601. The next prime is 28285657. The reversal of 28285636 is 63658282.

It can be written as a sum of positive squares in only one way, i.e., 25563136 + 2722500 = 5056^2 + 1650^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3535701 + ... + 3535708.

Almost surely, 2^28285636 is an apocalyptic number.

It is an amenable number.

28285636 is a deficient number, since it is larger than the sum of its proper divisors (21214234).

28285636 is a wasteful number, since it uses less digits than its factorization.

28285636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071413 (or 7071411 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 28285636 is about 5318.4242027127. The cubic root of 28285636 is about 304.6879761606.

It can be divided in two parts, 2828 and 5636, that added together give a square (8464 = 92²).

The spelling of 28285636 in words is "twenty-eight million, two hundred eighty-five thousand, six hundred thirty-six".