64667216 has 20 divisors (see below), whose sum is σ = 129614100. Its totient is φ = 31218432.

The previous prime is 64667173. The next prime is 64667219. The reversal of 64667216 is 61276646.

It can be written as a sum of positive squares in 2 ways, for example, as 21160000 + 43507216 = 4600^2 + 6596^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64667216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64667219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69221 + ... + 70148.

It is an arithmetic number, because the mean of its divisors is an integer number (6480705).

Almost surely, 2^64667216 is an apocalyptic number.

It is an amenable number.

64667216 is an abundant number, since it is smaller than the sum of its proper divisors (64946884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64667216 is a wasteful number, since it uses less digits than its factorization.

64667216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139406 (or 139400 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 64667216 is about 8041.5928770362. The cubic root of 64667216 is about 401.3852306359.

The spelling of 64667216 in words is "sixty-four million, six hundred sixty-seven thousand, two hundred sixteen".