13440028 has 24 divisors (see below), whose sum is σ = 27608672. Its totient is φ = 5603904.

The previous prime is 13440001. The next prime is 13440041. The reversal of 13440028 is 82004431.

It is a junction number, because it is equal to n+sod(n) for n = 13439990 and 13440008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5451 + ... + 7522.

Almost surely, 2^13440028 is an apocalyptic number.

It is an amenable number.

13440028 is an abundant number, since it is smaller than the sum of its proper divisors (14168644).

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

13440028 is a wasteful number, since it uses less digits than its factorization.

13440028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13021 (or 13019 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 13440028 is about 3666.0643747758. The cubic root of 13440028 is about 237.7570432194.

Adding to 13440028 its reverse (82004431), we get a palindrome (95444459).

The spelling of 13440028 in words is "thirteen million, four hundred forty thousand, twenty-eight".