64686318 has 16 divisors (see below), whose sum is σ = 129627216. Its totient is φ = 21519680.

The previous prime is 64686313. The next prime is 64686353. The reversal of 64686318 is 81368646.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64686318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64686311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7221 + ... + 13472.

It is an arithmetic number, because the mean of its divisors is an integer number (8101701).

Almost surely, 2^64686318 is an apocalyptic number.

64686318 is an abundant number, since it is smaller than the sum of its proper divisors (64940898).

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

64686318 is a wasteful number, since it uses less digits than its factorization.

64686318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21219.

The product of its digits is 165888, while the sum is 42.

The square root of 64686318 is about 8042.7804893581. The cubic root of 64686318 is about 401.4247483716.

The spelling of 64686318 in words is "sixty-four million, six hundred eighty-six thousand, three hundred eighteen".