64651222 has 4 divisors (see below), whose sum is σ = 96976836. Its totient is φ = 32325610.

The previous prime is 64651207. The next prime is 64651241. The reversal of 64651222 is 22215646.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16162804 + ... + 16162807.

It is an arithmetic number, because the mean of its divisors is an integer number (24244209).

Almost surely, 2^64651222 is an apocalyptic number.

64651222 is a deficient number, since it is larger than the sum of its proper divisors (32325614).

64651222 is a wasteful number, since it uses less digits than its factorization.

64651222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32325613.

The product of its digits is 5760, while the sum is 28.

The square root of 64651222 is about 8040.5983608187. The cubic root of 64651222 is about 401.3521366659.

Adding to 64651222 its reverse (22215646), we get a palindrome (86866868).

The spelling of 64651222 in words is "sixty-four million, six hundred fifty-one thousand, two hundred twenty-two".