620864209 has 16 divisors (see below), whose sum is σ = 717458560. Its totient is φ = 526279680.

The previous prime is 620864203. The next prime is 620864221. The reversal of 620864209 is 902468026.

It is a cyclic number.

It is not a de Polignac number, because 620864209 - 2¹⁷ = 620733137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620864203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243262 + ... + 245800.

It is an arithmetic number, because the mean of its divisors is an integer number (44841160).

Almost surely, 2^620864209 is an apocalyptic number.

It is an amenable number.

620864209 is a deficient number, since it is larger than the sum of its proper divisors (96594351).

620864209 is a wasteful number, since it uses less digits than its factorization.

620864209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 620864209 is about 24917.1468872341. The cubic root of 620864209 is about 853.0979039890.

The spelling of 620864209 in words is "six hundred twenty million, eight hundred sixty-four thousand, two hundred nine".