646242646 has 8 divisors (see below), whose sum is σ = 1107844560. Its totient is φ = 276961128.

The previous prime is 646242637. The next prime is 646242733.

646242646 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 646242599 and 646242608.

It is a congruent number.

It is an unprimeable number.

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, 23080081 + ... + 23080108.

It is an arithmetic number, because the mean of its divisors is an integer number (138480570).

Almost surely, 2^646242646 is an apocalyptic number.

646242646 is a deficient number, since it is larger than the sum of its proper divisors (461601914).

646242646 is a wasteful number, since it uses less digits than its factorization.

646242646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46160198.

The product of its digits is 331776, while the sum is 40.

The square root of 646242646 is about 25421.3029957160. The cubic root of 646242646 is about 864.5667675832.

The spelling of 646242646 in words is "six hundred forty-six million, two hundred forty-two thousand, six hundred forty-six".