28636636 has 24 divisors (see below), whose sum is σ = 60643296. Its totient is φ = 11550720.

The previous prime is 28636627. The next prime is 28636639. The reversal of 28636636 is 63663682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28636639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29605 + ... + 30556.

It is an arithmetic number, because the mean of its divisors is an integer number (2526804).

Almost surely, 2^28636636 is an apocalyptic number.

It is an amenable number.

28636636 is an abundant number, since it is smaller than the sum of its proper divisors (32006660).

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

28636636 is a wasteful number, since it uses less digits than its factorization.

28636636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60189 (or 60187 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 28636636 is about 5351.3209584177. The cubic root of 28636636 is about 305.9431024688.

The spelling of 28636636 in words is "twenty-eight million, six hundred thirty-six thousand, six hundred thirty-six".