64715218 has 4 divisors (see below), whose sum is σ = 97072830. Its totient is φ = 32357608.

The previous prime is 64715201. The next prime is 64715219. The reversal of 64715218 is 81251746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 62678889 + 2036329 = 7917^2 + 1427^2 .

It is not an unprimeable number, because it can be changed into a prime (64715219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16178803 + ... + 16178806.

Almost surely, 2^64715218 is an apocalyptic number.

64715218 is a deficient number, since it is larger than the sum of its proper divisors (32357612).

64715218 is a wasteful number, since it uses less digits than its factorization.

64715218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32357611.

The product of its digits is 13440, while the sum is 34.

The square root of 64715218 is about 8044.5769310760. The cubic root of 64715218 is about 401.4845211764.

The spelling of 64715218 in words is "sixty-four million, seven hundred fifteen thousand, two hundred eighteen".