16520864 has 12 divisors (see below), whose sum is σ = 32525514. Its totient is φ = 8260416.

The previous prime is 16520851. The next prime is 16520869. The reversal of 16520864 is 46802561.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 2890000 = 3692^2 + 1700^2 .

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: 516277 = 16520864 / (1 + 6 + 5 + 2 + 0 + 8 + 6 + 4).

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 16520864.

It is not an unprimeable number, because it can be changed into a prime (16520869) by changing a digit.

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 as a sum of consecutive naturals, namely, 258107 + ... + 258170.

Almost surely, 2^16520864 is an apocalyptic number.

It is an amenable number.

16520864 is a deficient number, since it is larger than the sum of its proper divisors (16004650).

16520864 is an equidigital number, since it uses as much as digits as its factorization.

16520864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516287 (or 516279 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 16520864 is about 4064.5865718422. The cubic root of 16520864 is about 254.6894283844.

The spelling of 16520864 in words is "sixteen million, five hundred twenty thousand, eight hundred sixty-four".