646422918 has 8 divisors (see below), whose sum is σ = 1292845848. Its totient is φ = 215474304.

The previous prime is 646422911. The next prime is 646422961. The reversal of 646422918 is 819224646.

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

646422918 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 646422918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646422911) 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 3 ways as a sum of consecutive naturals, for example, 53868571 + ... + 53868582.

It is an arithmetic number, because the mean of its divisors is an integer number (161605731).

Almost surely, 2^646422918 is an apocalyptic number.

646422918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646422918 is a wasteful number, since it uses less digits than its factorization.

646422918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107737158.

The product of its digits is 165888, while the sum is 42.

The square root of 646422918 is about 25424.8484361264. The cubic root of 646422918 is about 864.6471515748.

The spelling of 646422918 in words is "six hundred forty-six million, four hundred twenty-two thousand, nine hundred eighteen".