64684628664 has 32 divisors (see below), whose sum is σ = 161720257920. Its totient is φ = 21560384736.

The previous prime is 64684628663. The next prime is 64684628677. The reversal of 64684628664 is 46682648646.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 64684628598 and 64684628607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64684628663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465219 + ... + 588045.

It is an arithmetic number, because the mean of its divisors is an integer number (5053758060).

Almost surely, 2^64684628664 is an apocalyptic number.

It is an amenable number.

64684628664 is an abundant number, since it is smaller than the sum of its proper divisors (97035629256).

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

64684628664 is a wasteful number, since it uses less digits than its factorization.

64684628664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144779 (or 144775 counting only the distinct ones).

The product of its digits is 63700992, while the sum is 60.

The spelling of 64684628664 in words is "sixty-four billion, six hundred eighty-four million, six hundred twenty-eight thousand, six hundred sixty-four".