621264643 has 4 divisors (see below), whose sum is σ = 657809640. Its totient is φ = 584719648.

The previous prime is 621264619. The next prime is 621264647. The reversal of 621264643 is 346462126.

621264643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346462126 = 2 ⋅173231063.

It is a cyclic number.

It is not a de Polignac number, because 621264643 - 2⁹ = 621264131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621264599 and 621264608.

It is not an unprimeable number, because it can be changed into a prime (621264647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18272473 + ... + 18272506.

It is an arithmetic number, because the mean of its divisors is an integer number (164452410).

Almost surely, 2^621264643 is an apocalyptic number.

621264643 is a deficient number, since it is larger than the sum of its proper divisors (36544997).

621264643 is a wasteful number, since it uses less digits than its factorization.

621264643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36544996.

The product of its digits is 41472, while the sum is 34.

The square root of 621264643 is about 24925.1809020516. The cubic root of 621264643 is about 853.2812698983.

The spelling of 621264643 in words is "six hundred twenty-one million, two hundred sixty-four thousand, six hundred forty-three".