620644417 has 2 divisors, whose sum is σ = 620644418. Its totient is φ = 620644416.

The previous prime is 620644379. The next prime is 620644487. The reversal of 620644417 is 714446026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610633521 + 10010896 = 24711^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 620644417 - 2⁷ = 620644289 is a prime.

It is not a weakly prime, because it can be changed into another prime (620644487) 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 as a sum of consecutive naturals, namely, 310322208 + 310322209.

It is an arithmetic number, because the mean of its divisors is an integer number (310322209).

Almost surely, 2^620644417 is an apocalyptic number.

It is an amenable number.

620644417 is a deficient number, since it is larger than the sum of its proper divisors (1).

620644417 is an equidigital number, since it uses as much as digits as its factorization.

620644417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 620644417 is about 24912.7360400258. The cubic root of 620644417 is about 852.9972237746.

The spelling of 620644417 in words is "six hundred twenty million, six hundred forty-four thousand, four hundred seventeen".