620623643 has 2 divisors, whose sum is σ = 620623644. Its totient is φ = 620623642.

The previous prime is 620623631. The next prime is 620623649. The reversal of 620623643 is 346326026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620623643 - 2⁸ = 620623387 is a prime.

It is not a weakly prime, because it can be changed into another prime (620623649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310311821 + 310311822.

It is an arithmetic number, because the mean of its divisors is an integer number (310311822).

Almost surely, 2^620623643 is an apocalyptic number.

620623643 is a deficient number, since it is larger than the sum of its proper divisors (1).

620623643 is an equidigital number, since it uses as much as digits as its factorization.

620623643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 620623643 is about 24912.3191011997. The cubic root of 620623643 is about 852.9877065902.

Adding to 620623643 its reverse (346326026), we get a palindrome (966949669).

The spelling of 620623643 in words is "six hundred twenty million, six hundred twenty-three thousand, six hundred forty-three".