621650656 has 96 divisors (see below), whose sum is σ = 1388838528. Its totient is φ = 271434240.

The previous prime is 621650599. The next prime is 621650669. The reversal of 621650656 is 656056126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1013806 + ... + 1014418.

It is an arithmetic number, because the mean of its divisors is an integer number (14467068).

Almost surely, 2^621650656 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 621650656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694419264).

621650656 is an abundant number, since it is smaller than the sum of its proper divisors (767187872).

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

621650656 is a wasteful number, since it uses less digits than its factorization.

621650656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 621650656 is about 24932.9231338806. The cubic root of 621650656 is about 853.4579576014.

The spelling of 621650656 in words is "six hundred twenty-one million, six hundred fifty thousand, six hundred fifty-six".