64697216 has 16 divisors (see below), whose sum is σ = 128889240. Its totient is φ = 32348544.

The previous prime is 64697209. The next prime is 64697219. The reversal of 64697216 is 61279646.

64697216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64697219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252596 + ... + 252851.

Almost surely, 2^64697216 is an apocalyptic number.

It is an amenable number.

64697216 is a deficient number, since it is larger than the sum of its proper divisors (64192024).

64697216 is an equidigital number, since it uses as much as digits as its factorization.

64697216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505461 (or 505449 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 64697216 is about 8043.4579628416. The cubic root of 64697216 is about 401.4472903939.

The spelling of 64697216 in words is "sixty-four million, six hundred ninety-seven thousand, two hundred sixteen".