621631866 has 8 divisors (see below), whose sum is σ = 1243263744. Its totient is φ = 207210620.

The previous prime is 621631837. The next prime is 621631867. The reversal of 621631866 is 668136126.

621631866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

621631866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (621631867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51802650 + ... + 51802661.

It is an arithmetic number, because the mean of its divisors is an integer number (155407968).

Almost surely, 2^621631866 is an apocalyptic number.

621631866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

621631866 is a wasteful number, since it uses less digits than its factorization.

621631866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103605316.

The product of its digits is 62208, while the sum is 39.

The square root of 621631866 is about 24932.5463200211. The cubic root of 621631866 is about 853.4493586472.

The spelling of 621631866 in words is "six hundred twenty-one million, six hundred thirty-one thousand, eight hundred sixty-six".