646446512 has 20 divisors (see below), whose sum is σ = 1276123680. Its totient is φ = 317124288.

The previous prime is 646446491. The next prime is 646446517. The reversal of 646446512 is 215644646.

It is a super-2 number, since 2×646446512² = 835786185753932288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (646446517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380312 + ... + 382007.

It is an arithmetic number, because the mean of its divisors is an integer number (63806184).

Almost surely, 2^646446512 is an apocalyptic number.

It is an amenable number.

646446512 is a deficient number, since it is larger than the sum of its proper divisors (629677168).

646446512 is a wasteful number, since it uses less digits than its factorization.

646446512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762380 (or 762374 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 646446512 is about 25425.3124267923. The cubic root of 646446512 is about 864.6576711259.

The spelling of 646446512 in words is "six hundred forty-six million, four hundred forty-six thousand, five hundred twelve".