621205404 has 96 divisors (see below), whose sum is σ = 1567641600. Its totient is φ = 191009280.

The previous prime is 621205397. The next prime is 621205411. The reversal of 621205404 is 404502126.

621205404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (621205397) and next prime (621205411).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 959809 + ... + 960455.

It is an arithmetic number, because the mean of its divisors is an integer number (16329600).

Almost surely, 2^621205404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621205404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783820800).

621205404 is an abundant number, since it is smaller than the sum of its proper divisors (946436196).

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

621205404 is a wasteful number, since it uses less digits than its factorization.

621205404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 621205404 is about 24923.9925373123. The cubic root of 621205404 is about 853.2541482648.

The spelling of 621205404 in words is "six hundred twenty-one million, two hundred five thousand, four hundred four".