28506236 has 24 divisors (see below), whose sum is σ = 56179200. Its totient is φ = 12538800.

The previous prime is 28506221. The next prime is 28506239. The reversal of 28506236 is 63260582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28506239) 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, 9086 + ... + 11813.

It is an arithmetic number, because the mean of its divisors is an integer number (2340800).

Almost surely, 2^28506236 is an apocalyptic number.

It is an amenable number.

28506236 is a deficient number, since it is larger than the sum of its proper divisors (27672964).

28506236 is a wasteful number, since it uses less digits than its factorization.

28506236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20945 (or 20943 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 28506236 is about 5339.1231489824. The cubic root of 28506236 is about 305.4780142094.

The spelling of 28506236 in words is "twenty-eight million, five hundred six thousand, two hundred thirty-six".