64688208 has 80 divisors (see below), whose sum is σ = 182280000. Its totient is φ = 19648512.

The previous prime is 64688191. The next prime is 64688209. The reversal of 64688208 is 80288646.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 64688208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64688209) 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 in 15 ways as a sum of consecutive naturals, for example, 51168 + ... + 52416.

It is an arithmetic number, because the mean of its divisors is an integer number (2278500).

Almost surely, 2^64688208 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 64688208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91140000).

64688208 is an abundant number, since it is smaller than the sum of its proper divisors (117591792).

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

64688208 is a wasteful number, since it uses less digits than its factorization.

64688208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 64688208 is about 8042.8979851792. The cubic root of 64688208 is about 401.4286579330.

The spelling of 64688208 in words is "sixty-four million, six hundred eighty-eight thousand, two hundred eight".