620205664 has 72 divisors (see below), whose sum is σ = 1341145512. Its totient is φ = 282147840.

The previous prime is 620205653. The next prime is 620205721. The reversal of 620205664 is 466502026.

620205664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393999 + ... + 395569.

It is an arithmetic number, because the mean of its divisors is an integer number (18627021).

Almost surely, 2^620205664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620205664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670572756).

620205664 is an abundant number, since it is smaller than the sum of its proper divisors (720939848).

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

620205664 is a wasteful number, since it uses less digits than its factorization.

620205664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 620205664 is about 24903.9286860527. The cubic root of 620205664 is about 852.7961728958.

The spelling of 620205664 in words is "six hundred twenty million, two hundred five thousand, six hundred sixty-four".