16000645 has 4 divisors (see below), whose sum is σ = 19200780. Its totient is φ = 12800512.

The previous prime is 16000627. The next prime is 16000667. The reversal of 16000645 is 54600061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6260004 + 9740641 = 2502^2 + 3121^2 .

It is a cyclic number.

It is not a de Polignac number, because 16000645 - 2⁹ = 16000133 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600060 + ... + 1600069.

It is an arithmetic number, because the mean of its divisors is an integer number (4800195).

Almost surely, 2^16000645 is an apocalyptic number.

It is an amenable number.

16000645 is a deficient number, since it is larger than the sum of its proper divisors (3200135).

16000645 is an equidigital number, since it uses as much as digits as its factorization.

16000645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200134.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16000645 is about 4000.0806241875. The cubic root of 16000645 is about 251.9875959713.

The spelling of 16000645 in words is "sixteen million, six hundred forty-five", and thus it is an aban number.