621643104 has 36 divisors (see below), whose sum is σ = 1767798396. Its totient is φ = 207214272.

The previous prime is 621643069. The next prime is 621643109. The reversal of 621643104 is 401346126.

621643104 is a `hidden beast` number, since 6 + 2 + 1 + 643 + 10 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621643109) 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 5 ways as a sum of consecutive naturals, for example, 1078954 + ... + 1079529.

It is an arithmetic number, because the mean of its divisors is an integer number (49105511).

Almost surely, 2^621643104 is an apocalyptic number.

It is an amenable number.

621643104 is an abundant number, since it is smaller than the sum of its proper divisors (1146155292).

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

621643104 is a wasteful number, since it uses less digits than its factorization.

621643104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158499 (or 2158488 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 621643104 is about 24932.7716870788. The cubic root of 621643104 is about 853.4545015657.

The spelling of 621643104 in words is "six hundred twenty-one million, six hundred forty-three thousand, one hundred four".