646994144 has 12 divisors (see below), whose sum is σ = 1273769784. Its totient is φ = 323497056.

The previous prime is 646994129. The next prime is 646994203. The reversal of 646994144 is 441499646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109252 + ... + 10109315.

It is an arithmetic number, because the mean of its divisors is an integer number (106147482).

Almost surely, 2^646994144 is an apocalyptic number.

It is an amenable number.

646994144 is a deficient number, since it is larger than the sum of its proper divisors (626775640).

646994144 is a wasteful number, since it uses less digits than its factorization.

646994144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20218577 (or 20218569 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 646994144 is about 25436.0795721353. The cubic root of 646994144 is about 864.9017648251.

The spelling of 646994144 in words is "six hundred forty-six million, nine hundred ninety-four thousand, one hundred forty-four".