620545717 has 12 divisors (see below), whose sum is σ = 688854348. Its totient is φ = 558536000.

The previous prime is 620545699. The next prime is 620545721. The reversal of 620545717 is 717545026.

It can be written as a sum of positive squares in 2 ways, for example, as 567678276 + 52867441 = 23826^2 + 7271^2 .

It is not a de Polignac number, because 620545717 - 2¹¹ = 620543669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620545517) 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 11 ways as a sum of consecutive naturals, for example, 13168 + ... + 37609.

It is an arithmetic number, because the mean of its divisors is an integer number (57404529).

Almost surely, 2^620545717 is an apocalyptic number.

It is an amenable number.

620545717 is a deficient number, since it is larger than the sum of its proper divisors (68308631).

620545717 is a wasteful number, since it uses less digits than its factorization.

620545717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50900 (or 50889 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 620545717 is about 24910.7550467664. The cubic root of 620545717 is about 852.9520044902.

The spelling of 620545717 in words is "six hundred twenty million, five hundred forty-five thousand, seven hundred seventeen".