620449717 has 4 divisors (see below), whose sum is σ = 640464256. Its totient is φ = 600435180.

The previous prime is 620449699. The next prime is 620449777. The reversal of 620449717 is 717944026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 717944026 = 2 ⋅358972013.

It is a cyclic number.

It is not a de Polignac number, because 620449717 - 2¹⁹ = 619925429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620449717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620449777) 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 3 ways as a sum of consecutive naturals, for example, 10007223 + ... + 10007284.

It is an arithmetic number, because the mean of its divisors is an integer number (160116064).

Almost surely, 2^620449717 is an apocalyptic number.

It is an amenable number.

620449717 is a deficient number, since it is larger than the sum of its proper divisors (20014539).

620449717 is a wasteful number, since it uses less digits than its factorization.

620449717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20014538.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 620449717 is about 24908.8280936699. The cubic root of 620449717 is about 852.9080176073.

The spelling of 620449717 in words is "six hundred twenty million, four hundred forty-nine thousand, seven hundred seventeen".