621918944 has 48 divisors (see below), whose sum is σ = 1301489280. Its totient is φ = 291703680.

The previous prime is 621918929. The next prime is 621918971. The reversal of 621918944 is 449819126.

It is a junction number, because it is equal to n+sod(n) for n = 621918895 and 621918904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57659 + ... + 67589.

It is an arithmetic number, because the mean of its divisors is an integer number (27114360).

Almost surely, 2^621918944 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 621918944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (650744640).

621918944 is an abundant number, since it is smaller than the sum of its proper divisors (679570336).

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

621918944 is a wasteful number, since it uses less digits than its factorization.

621918944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10063 (or 10055 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 621918944 is about 24938.3027489843. The cubic root of 621918944 is about 853.5807165791.

The spelling of 621918944 in words is "six hundred twenty-one million, nine hundred eighteen thousand, nine hundred forty-four".