621724816 has 40 divisors (see below), whose sum is σ = 1279203840. Its totient is φ = 291715584.

The previous prime is 621724813. The next prime is 621724849. The reversal of 621724816 is 618427126.

It is not an unprimeable number, because it can be changed into a prime (621724813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94465 + ... + 100831.

It is an arithmetic number, because the mean of its divisors is an integer number (31980096).

Almost surely, 2^621724816 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 621724816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639601920).

621724816 is an abundant number, since it is smaller than the sum of its proper divisors (657479024).

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

621724816 is a wasteful number, since it uses less digits than its factorization.

621724816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6751 (or 6745 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 621724816 is about 24934.4102797720. The cubic root of 621724816 is about 853.4918940923.

The spelling of 621724816 in words is "six hundred twenty-one million, seven hundred twenty-four thousand, eight hundred sixteen".