64716784 has 40 divisors (see below), whose sum is σ = 138741120. Its totient is φ = 28996800.

The previous prime is 64716781. The next prime is 64716797. The reversal of 64716784 is 48761746.

It is a self number, because there is not a number n which added to its sum of digits gives 64716784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64716781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9907 + ... + 15085.

It is an arithmetic number, because the mean of its divisors is an integer number (3468528).

Almost surely, 2^64716784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64716784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69370560).

64716784 is an abundant number, since it is smaller than the sum of its proper divisors (74024336).

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

64716784 is a wasteful number, since it uses less digits than its factorization.

64716784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269 (or 5263 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 64716784 is about 8044.6742631383. The cubic root of 64716784 is about 401.4877595681.

The spelling of 64716784 in words is "sixty-four million, seven hundred sixteen thousand, seven hundred eighty-four".