28113312 has 48 divisors (see below), whose sum is σ = 77686560. Its totient is φ = 8877312.

The previous prime is 28113307. The next prime is 28113313. The reversal of 28113312 is 21331182.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28113313) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5883 + ... + 9530.

It is an arithmetic number, because the mean of its divisors is an integer number (1618470).

Almost surely, 2^28113312 is an apocalyptic number.

It is an amenable number.

28113312 is an abundant number, since it is smaller than the sum of its proper divisors (49573248).

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

28113312 is a wasteful number, since it uses less digits than its factorization.

28113312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15445 (or 15437 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 28113312 is about 5302.1987891817. The cubic root of 28113312 is about 304.0679672591.

Adding to 28113312 its reverse (21331182), we get a palindrome (49444494).

The spelling of 28113312 in words is "twenty-eight million, one hundred thirteen thousand, three hundred twelve".