16440028 has 18 divisors (see below), whose sum is σ = 31624208. Its totient is φ = 7472520.

The previous prime is 16440019. The next prime is 16440029. The reversal of 16440028 is 82004461.

It is a junction number, because it is equal to n+sod(n) for n = 16439984 and 16440011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440029) 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, 16500 + ... + 17467.

Almost surely, 2^16440028 is an apocalyptic number.

It is an amenable number.

16440028 is a deficient number, since it is larger than the sum of its proper divisors (15184180).

16440028 is a wasteful number, since it uses less digits than its factorization.

16440028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33993 (or 33980 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 16440028 is about 4054.6304393866. The cubic root of 16440028 is about 254.2733535933.

Adding to 16440028 its reverse (82004461), we get a palindrome (98444489).

It can be divided in two parts, 16 and 440028, that added together give a palindrome (440044).

The spelling of 16440028 in words is "sixteen million, four hundred forty thousand, twenty-eight".