16428643 has 8 divisors (see below), whose sum is σ = 20482560. Its totient is φ = 12801480.

The previous prime is 16428611. The next prime is 16428653. The reversal of 16428643 is 34682461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16428643 - 2⁵ = 16428611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16428599 and 16428608.

It is not an unprimeable number, because it can be changed into a prime (16428653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106603 + ... + 106756.

It is an arithmetic number, because the mean of its divisors is an integer number (2560320).

Almost surely, 2^16428643 is an apocalyptic number.

16428643 is a deficient number, since it is larger than the sum of its proper divisors (4053917).

16428643 is a wasteful number, since it uses less digits than its factorization.

16428643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213377.

The product of its digits is 27648, while the sum is 34.

The square root of 16428643 is about 4053.2262458442. The cubic root of 16428643 is about 254.2146438262.

It can be divided in two parts, 16428 and 643, that added together give a palindrome (17071).

The spelling of 16428643 in words is "sixteen million, four hundred twenty-eight thousand, six hundred forty-three".