621981360 has 480 divisors, whose sum is σ = 2807820288. Its totient is φ = 119162880.

The previous prime is 621981343. The next prime is 621981361. The reversal of 621981360 is 63189126.

621981360 is a `hidden beast` number, since 6 + 219 + 81 + 360 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (621981361) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 720289 + ... + 721151.

Almost surely, 2^621981360 is an apocalyptic number.

621981360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621981360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1403910144).

621981360 is an abundant number, since it is smaller than the sum of its proper divisors (2185838928).

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

621981360 is a wasteful number, since it uses less digits than its factorization.

621981360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 621981360 is about 24939.5541259261. The cubic root of 621981360 is about 853.6092708423.

The spelling of 621981360 in words is "six hundred twenty-one million, nine hundred eighty-one thousand, three hundred sixty".