620640211 has 8 divisors (see below), whose sum is σ = 647880480. Its totient is φ = 593421312.

The previous prime is 620640197. The next prime is 620640221. The reversal of 620640211 is 112046026.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620640211 - 2⁵ = 620640179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620640221) 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 7 ways as a sum of consecutive naturals, for example, 91795 + ... + 98323.

It is an arithmetic number, because the mean of its divisors is an integer number (80985060).

Almost surely, 2^620640211 is an apocalyptic number.

620640211 is a deficient number, since it is larger than the sum of its proper divisors (27240269).

620640211 is a wasteful number, since it uses less digits than its factorization.

620640211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10685.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 620640211 is about 24912.6516252285. The cubic root of 620640211 is about 852.9952968987.

Adding to 620640211 its reverse (112046026), we get a palindrome (732686237).

The spelling of 620640211 in words is "six hundred twenty million, six hundred forty thousand, two hundred eleven".