621323623 has 4 divisors (see below), whose sum is σ = 622275768. Its totient is φ = 620371480.

The previous prime is 621323621. The next prime is 621323663. The reversal of 621323623 is 326323126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621323623 - 2¹ = 621323621 is a prime.

It is a super-2 number, since 2×621323623² = 772086088995692258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621323591 and 621323600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621323621) 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 3 ways as a sum of consecutive naturals, for example, 475093 + ... + 476398.

It is an arithmetic number, because the mean of its divisors is an integer number (155568942).

Almost surely, 2^621323623 is an apocalyptic number.

621323623 is a deficient number, since it is larger than the sum of its proper divisors (952145).

621323623 is an equidigital number, since it uses as much as digits as its factorization.

621323623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952144.

The product of its digits is 7776, while the sum is 28.

The square root of 621323623 is about 24926.3640148338. The cubic root of 621323623 is about 853.3082712400.

Adding to 621323623 its reverse (326323126), we get a palindrome (947646749).

The spelling of 621323623 in words is "six hundred twenty-one million, three hundred twenty-three thousand, six hundred twenty-three".