28409112 has 24 divisors (see below), whose sum is σ = 76941540. Its totient is φ = 9469680.

The previous prime is 28409099. The next prime is 28409131. The reversal of 28409112 is 21190482.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197214 + ... + 197357.

Almost surely, 2^28409112 is an apocalyptic number.

It is an amenable number.

28409112 is an abundant number, since it is smaller than the sum of its proper divisors (48532428).

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

28409112 is a wasteful number, since it uses less digits than its factorization.

28409112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394583 (or 394576 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28409112 is about 5330.0198873925. The cubic root of 28409112 is about 305.1306866272.

Adding to 28409112 its reverse (21190482), we get a palindrome (49599594).

The spelling of 28409112 in words is "twenty-eight million, four hundred nine thousand, one hundred twelve".