621730324 has 30 divisors (see below), whose sum is σ = 1156650194. Its totient is φ = 292421760.

The previous prime is 621730321. The next prime is 621730337. The reversal of 621730324 is 423037126.

It can be written as a sum of positive squares in 5 ways, for example, as 19518724 + 602211600 = 4418^2 + 24540^2 .

It is a super-2 number, since 2×621730324² = 773097191562289952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621730292 and 621730301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621730321) 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 9 ways as a sum of consecutive naturals, for example, 333154 + ... + 335014.

Almost surely, 2^621730324 is an apocalyptic number.

It is an amenable number.

621730324 is a deficient number, since it is larger than the sum of its proper divisors (534919870).

621730324 is an equidigital number, since it uses as much as digits as its factorization.

621730324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933 (or 1880 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 621730324 is about 24934.5207293022. The cubic root of 621730324 is about 853.4944145104.

The spelling of 621730324 in words is "six hundred twenty-one million, seven hundred thirty thousand, three hundred twenty-four".