646440622 has 16 divisors (see below), whose sum is σ = 1013111712. Its totient is φ = 308772640.

The previous prime is 646440611. The next prime is 646440637. The reversal of 646440622 is 226044646.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29208 + ... + 46324.

It is an arithmetic number, because the mean of its divisors is an integer number (63319482).

Almost surely, 2^646440622 is an apocalyptic number.

646440622 is a deficient number, since it is larger than the sum of its proper divisors (366671090).

646440622 is a wasteful number, since it uses less digits than its factorization.

646440622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17963.

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 646440622 is about 25425.1965970767. The cubic root of 646440622 is about 864.6550450519.

The spelling of 646440622 in words is "six hundred forty-six million, four hundred forty thousand, six hundred twenty-two".