64891318 has 4 divisors (see below), whose sum is σ = 97336980. Its totient is φ = 32445658.

The previous prime is 64891279. The next prime is 64891361. The reversal of 64891318 is 81319846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81319846 = 2 ⋅40659923.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16222828 + ... + 16222831.

It is an arithmetic number, because the mean of its divisors is an integer number (24334245).

Almost surely, 2^64891318 is an apocalyptic number.

64891318 is a deficient number, since it is larger than the sum of its proper divisors (32445662).

64891318 is a wasteful number, since it uses less digits than its factorization.

64891318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32445661.

The product of its digits is 41472, while the sum is 40.

The square root of 64891318 is about 8055.5147569848. The cubic root of 64891318 is about 401.8483582734.

The spelling of 64891318 in words is "sixty-four million, eight hundred ninety-one thousand, three hundred eighteen".