620434809 has 20 divisors (see below), whose sum is σ = 928815360. Its totient is φ = 412733880.

The previous prime is 620434769. The next prime is 620434813. The reversal of 620434809 is 908434026.

It is a happy number.

It is not a de Polignac number, because 620434809 - 2⁸ = 620434553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620434879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30804 + ... + 46794.

It is an arithmetic number, because the mean of its divisors is an integer number (46440768).

Almost surely, 2^620434809 is an apocalyptic number.

It is an amenable number.

620434809 is a deficient number, since it is larger than the sum of its proper divisors (308380551).

620434809 is a wasteful number, since it uses less digits than its factorization.

620434809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16482 (or 16473 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 620434809 is about 24908.5288405397. The cubic root of 620434809 is about 852.9011864039.

The spelling of 620434809 in words is "six hundred twenty million, four hundred thirty-four thousand, eight hundred nine".