621438863 has 8 divisors (see below), whose sum is σ = 648712800. Its totient is φ = 594186208.

The previous prime is 621438827. The next prime is 621438887. The reversal of 621438863 is 368834126.

It is a happy number.

621438863 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.

It is a cyclic number.

It is not a de Polignac number, because 621438863 - 2²⁴ = 604661647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621438863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621438463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94073 + ... + 100461.

It is an arithmetic number, because the mean of its divisors is an integer number (81089100).

Almost surely, 2^621438863 is an apocalyptic number.

621438863 is a deficient number, since it is larger than the sum of its proper divisors (27273937).

621438863 is a wasteful number, since it uses less digits than its factorization.

621438863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10641.

The product of its digits is 165888, while the sum is 41.

The square root of 621438863 is about 24928.6755163607. The cubic root of 621438863 is about 853.3610237630.

The spelling of 621438863 in words is "six hundred twenty-one million, four hundred thirty-eight thousand, eight hundred sixty-three".