621936420 has 72 divisors (see below), whose sum is σ = 2025745344. Its totient is φ = 142156224.

The previous prime is 621936389. The next prime is 621936431. The reversal of 621936420 is 24639126.

621936420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102832 + ... + 108711.

It is an arithmetic number, because the mean of its divisors is an integer number (28135352).

Almost surely, 2^621936420 is an apocalyptic number.

621936420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621936420 is an abundant number, since it is smaller than the sum of its proper divisors (1403808924).

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

621936420 is a wasteful number, since it uses less digits than its factorization.

621936420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211569 (or 211560 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 621936420 is about 24938.6531312339. The cubic root of 621936420 is about 853.5887117458.

The spelling of 621936420 in words is "six hundred twenty-one million, nine hundred thirty-six thousand, four hundred twenty".