621047220 has 48 divisors (see below), whose sum is σ = 1785936768. Its totient is φ = 161136000.

The previous prime is 621047201. The next prime is 621047221. The reversal of 621047220 is 22740126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621047221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137656 + ... + 142095.

It is an arithmetic number, because the mean of its divisors is an integer number (37207016).

Almost surely, 2^621047220 is an apocalyptic number.

621047220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621047220 is an abundant number, since it is smaller than the sum of its proper divisors (1164889548).

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

621047220 is a wasteful number, since it uses less digits than its factorization.

621047220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279800 (or 279798 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 621047220 is about 24920.8190074082. The cubic root of 621047220 is about 853.1817177872.

Adding to 621047220 its reverse (22740126), we get a palindrome (643787346).

The spelling of 621047220 in words is "six hundred twenty-one million, forty-seven thousand, two hundred twenty".