646423242 has 32 divisors (see below), whose sum is σ = 1327104000. Its totient is φ = 209811888.

The previous prime is 646423213. The next prime is 646423259. The reversal of 646423242 is 242324646.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50359 + ... + 61877.

It is an arithmetic number, because the mean of its divisors is an integer number (41472000).

Almost surely, 2^646423242 is an apocalyptic number.

646423242 is an abundant number, since it is smaller than the sum of its proper divisors (680680758).

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

646423242 is a wasteful number, since it uses less digits than its factorization.

646423242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11770.

The product of its digits is 55296, while the sum is 33.

The square root of 646423242 is about 25424.8548078450. The cubic root of 646423242 is about 864.6472960342.

Adding to 646423242 its reverse (242324646), we get a palindrome (888747888).

The spelling of 646423242 in words is "six hundred forty-six million, four hundred twenty-three thousand, two hundred forty-two".