646379218 has 8 divisors (see below), whose sum is σ = 969982848. Its totient is φ = 323051604.

The previous prime is 646379197. The next prime is 646379257. The reversal of 646379218 is 812973646.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63046 + ... + 72577.

It is an arithmetic number, because the mean of its divisors is an integer number (121247856).

Almost surely, 2^646379218 is an apocalyptic number.

646379218 is a deficient number, since it is larger than the sum of its proper divisors (323603630).

646379218 is a wasteful number, since it uses less digits than its factorization.

646379218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138008.

The product of its digits is 435456, while the sum is 46.

The square root of 646379218 is about 25423.9890261147. The cubic root of 646379218 is about 864.6276669459.

It can be divided in two parts, 6463792 and 18, that added together give a triangular number (6463810 = T₃₅₉₅).

The spelling of 646379218 in words is "six hundred forty-six million, three hundred seventy-nine thousand, two hundred eighteen".