620664673 has 4 divisors (see below), whose sum is σ = 622453680. Its totient is φ = 618875668.

The previous prime is 620664643. The next prime is 620664703. The reversal of 620664673 is 376466026.

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: 376466026 = 2 ⋅188233013.

It is an interprime number because it is at equal distance from previous prime (620664643) and next prime (620664703).

It is a cyclic number.

It is not a de Polignac number, because 620664673 - 2¹³ = 620656481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620664613) 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 3 ways as a sum of consecutive naturals, for example, 893983 + ... + 894676.

It is an arithmetic number, because the mean of its divisors is an integer number (155613420).

Almost surely, 2^620664673 is an apocalyptic number.

It is an amenable number.

620664673 is a deficient number, since it is larger than the sum of its proper divisors (1789007).

620664673 is a wasteful number, since it uses less digits than its factorization.

620664673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789006.

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 620664673 is about 24913.1425757571. The cubic root of 620664673 is about 853.0065034434.

The spelling of 620664673 in words is "six hundred twenty million, six hundred sixty-four thousand, six hundred seventy-three".