621355420 has 48 divisors (see below), whose sum is σ = 1505226240. Its totient is φ = 211040064.

The previous prime is 621355409. The next prime is 621355429. The reversal of 621355420 is 24553126.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621355429) 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 15 ways as a sum of consecutive naturals, for example, 5760 + ... + 35719.

It is an arithmetic number, because the mean of its divisors is an integer number (31358880).

Almost surely, 2^621355420 is an apocalyptic number.

It is an amenable number.

621355420 is an abundant number, since it is smaller than the sum of its proper divisors (883870820).

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

621355420 is a wasteful number, since it uses less digits than its factorization.

621355420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41602 (or 41600 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 621355420 is about 24927.0018253299. The cubic root of 621355420 is about 853.3228273582.

The spelling of 621355420 in words is "six hundred twenty-one million, three hundred fifty-five thousand, four hundred twenty".