621443646 has 12 divisors (see below), whose sum is σ = 1346461272. Its totient is φ = 207147876.

The previous prime is 621443623. The next prime is 621443743. The reversal of 621443646 is 646344126.

621443646 is a `hidden beast` number, since 6 + 2 + 1 + 4 + 4 + 3 + 646 = 666.

621443646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 621443646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17262306 + ... + 17262341.

It is an arithmetic number, because the mean of its divisors is an integer number (112205106).

Almost surely, 2^621443646 is an apocalyptic number.

621443646 is an abundant number, since it is smaller than the sum of its proper divisors (725017626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621443646 is a wasteful number, since it uses less digits than its factorization.

621443646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34524655 (or 34524652 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 621443646 is about 24928.7714498729. The cubic root of 621443646 is about 853.3632130990.

The spelling of 621443646 in words is "six hundred twenty-one million, four hundred forty-three thousand, six hundred forty-six".