64643222 has 16 divisors (see below), whose sum is σ = 112154112. Its totient is φ = 27369960.

The previous prime is 64643221. The next prime is 64643261. The reversal of 64643222 is 22234646.

64643222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64643221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26654 + ... + 28977.

It is an arithmetic number, because the mean of its divisors is an integer number (7009632).

Almost surely, 2^64643222 is an apocalyptic number.

64643222 is a deficient number, since it is larger than the sum of its proper divisors (47510890).

64643222 is a wasteful number, since it uses less digits than its factorization.

64643222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55723.

The product of its digits is 13824, while the sum is 29.

The square root of 64643222 is about 8040.1008700140. The cubic root of 64643222 is about 401.3355814257.

Adding to 64643222 its reverse (22234646), we get a palindrome (86877868).

The spelling of 64643222 in words is "sixty-four million, six hundred forty-three thousand, two hundred twenty-two".