620641209 has 16 divisors (see below), whose sum is σ = 856739520. Its totient is φ = 399174720.

The previous prime is 620641193. The next prime is 620641243. The reversal of 620641209 is 902146026.

It is not a de Polignac number, because 620641209 - 2⁴ = 620641193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620641249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160519 + ... + 164339.

It is an arithmetic number, because the mean of its divisors is an integer number (53546220).

Almost surely, 2^620641209 is an apocalyptic number.

It is an amenable number.

620641209 is a deficient number, since it is larger than the sum of its proper divisors (236098311).

620641209 is a wasteful number, since it uses less digits than its factorization.

620641209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 620641209 is about 24912.6716552039. The cubic root of 620641209 is about 852.9957541087.

The spelling of 620641209 in words is "six hundred twenty million, six hundred forty-one thousand, two hundred nine".