64721318 has 8 divisors (see below), whose sum is σ = 97725360. Its totient is φ = 32146200.

The previous prime is 64721317. The next prime is 64721323. The reversal of 64721318 is 81312746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64721311) 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, 106853 + ... + 107456.

It is an arithmetic number, because the mean of its divisors is an integer number (12215670).

Almost surely, 2^64721318 is an apocalyptic number.

64721318 is a deficient number, since it is larger than the sum of its proper divisors (33004042).

64721318 is a wasteful number, since it uses less digits than its factorization.

64721318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214462.

The product of its digits is 8064, while the sum is 32.

The square root of 64721318 is about 8044.9560595444. The cubic root of 64721318 is about 401.4971353070.

The spelling of 64721318 in words is "sixty-four million, seven hundred twenty-one thousand, three hundred eighteen".