621981860 has 24 divisors (see below), whose sum is σ = 1309815360. Its totient is φ = 248096864.

The previous prime is 621981859. The next prime is 621981887. The reversal of 621981860 is 68189126.

It is a super-3 number, since 3×621981860³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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, 36134 + ... + 50493.

It is an arithmetic number, because the mean of its divisors is an integer number (54575640).

Almost surely, 2^621981860 is an apocalyptic number.

It is an amenable number.

621981860 is an abundant number, since it is smaller than the sum of its proper divisors (687833500).

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

621981860 is a wasteful number, since it uses less digits than its factorization.

621981860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86995 (or 86993 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 621981860 is about 24939.5641501611. The cubic root of 621981860 is about 853.6094995762.

The spelling of 621981860 in words is "six hundred twenty-one million, nine hundred eighty-one thousand, eight hundred sixty".