28013612 has 12 divisors (see below), whose sum is σ = 53480616. Its totient is φ = 12733440.

The previous prime is 28013611. The next prime is 28013617. The reversal of 28013612 is 21631082.

It is not an unprimeable number, because it can be changed into a prime (28013611) 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 3 ways as a sum of consecutive naturals, for example, 318293 + ... + 318380.

It is an arithmetic number, because the mean of its divisors is an integer number (4456718).

Almost surely, 2^28013612 is an apocalyptic number.

28013612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28013612 is a deficient number, since it is larger than the sum of its proper divisors (25467004).

28013612 is a wasteful number, since it uses less digits than its factorization.

28013612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636688 (or 636686 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28013612 is about 5292.7886789480. The cubic root of 28013612 is about 303.7080964171.

Adding to 28013612 its reverse (21631082), we get a palindrome (49644694).

The spelling of 28013612 in words is "twenty-eight million, thirteen thousand, six hundred twelve".