64939218 has 32 divisors (see below), whose sum is σ = 141243264. Its totient is φ = 19821312.

The previous prime is 64939213. The next prime is 64939229. The reversal of 64939218 is 81293946.

It is a self number, because there is not a number n which added to its sum of digits gives 64939218.

It is not an unprimeable number, because it can be changed into a prime (64939213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4830 + ... + 12377.

It is an arithmetic number, because the mean of its divisors is an integer number (4413852).

Almost surely, 2^64939218 is an apocalyptic number.

64939218 is an abundant number, since it is smaller than the sum of its proper divisors (76304046).

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

64939218 is a wasteful number, since it uses less digits than its factorization.

64939218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17266.

The product of its digits is 93312, while the sum is 42.

The square root of 64939218 is about 8058.4873270360. The cubic root of 64939218 is about 401.9472097210.

The spelling of 64939218 in words is "sixty-four million, nine hundred thirty-nine thousand, two hundred eighteen".