28240236 has 18 divisors (see below), whose sum is σ = 71385132. Its totient is φ = 9413400.

The previous prime is 28240211. The next prime is 28240237. The reversal of 28240236 is 63204282.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (28240237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392190 + ... + 392261.

Almost surely, 2^28240236 is an apocalyptic number.

It is an amenable number.

28240236 is an abundant number, since it is smaller than the sum of its proper divisors (43144896).

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

28240236 is a wasteful number, since it uses less digits than its factorization.

28240236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784461 (or 784456 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28240236 is about 5314.1543071311. The cubic root of 28240236 is about 304.5248752196.

The spelling of 28240236 in words is "twenty-eight million, two hundred forty thousand, two hundred thirty-six".