646456426 has 16 divisors (see below), whose sum is σ = 1208957760. Its totient is φ = 251866080.

The previous prime is 646456411. The next prime is 646456427. The reversal of 646456426 is 624654646.

It is not an unprimeable number, because it can be changed into a prime (646456427) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 2098731 + ... + 2099038.

It is an arithmetic number, because the mean of its divisors is an integer number (75559860).

Almost surely, 2^646456426 is an apocalyptic number.

646456426 is a deficient number, since it is larger than the sum of its proper divisors (562501334).

646456426 is a wasteful number, since it uses less digits than its factorization.

646456426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197789.

The product of its digits is 829440, while the sum is 43.

The square root of 646456426 is about 25425.5073892341. The cubic root of 646456426 is about 864.6620912762.

The spelling of 646456426 in words is "six hundred forty-six million, four hundred fifty-six thousand, four hundred twenty-six".