646754222 has 8 divisors (see below), whose sum is σ = 1027197936. Its totient is φ = 304354912.

The previous prime is 646754221. The next prime is 646754249. The reversal of 646754222 is 222457646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646754221) 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 in 3 ways as a sum of consecutive naturals, for example, 9511058 + ... + 9511125.

It is an arithmetic number, because the mean of its divisors is an integer number (128399742).

Almost surely, 2^646754222 is an apocalyptic number.

646754222 is a deficient number, since it is larger than the sum of its proper divisors (380443714).

646754222 is a wasteful number, since it uses less digits than its factorization.

646754222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19022202.

The product of its digits is 161280, while the sum is 38.

The square root of 646754222 is about 25431.3629599359. The cubic root of 646754222 is about 864.7948423651.

The spelling of 646754222 in words is "six hundred forty-six million, seven hundred fifty-four thousand, two hundred twenty-two".