16321568 has 12 divisors (see below), whose sum is σ = 32133150. Its totient is φ = 8160768.

The previous prime is 16321561. The next prime is 16321573. The reversal of 16321568 is 86512361.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14047504 + 2274064 = 3748^2 + 1508^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 510049 = 16321568 / (1 + 6 + 3 + 2 + 1 + 5 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (16321561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254993 + ... + 255056.

Almost surely, 2^16321568 is an apocalyptic number.

It is an amenable number.

16321568 is a deficient number, since it is larger than the sum of its proper divisors (15811582).

16321568 is an equidigital number, since it uses as much as digits as its factorization.

16321568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510059 (or 510051 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 16321568 is about 4039.9960396020. The cubic root of 16321568 is about 253.6611514836.

Adding to 16321568 its sum of digits (32), we get a square (16321600 = 4040²).

The spelling of 16321568 in words is "sixteen million, three hundred twenty-one thousand, five hundred sixty-eight".