620666077 has 4 divisors (see below), whose sum is σ = 635804316. Its totient is φ = 605527840.

The previous prime is 620666047. The next prime is 620666087. The reversal of 620666077 is 770666026.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 321341476 + 299324601 = 17926^2 + 17301^2 .

It is a cyclic number.

It is not a de Polignac number, because 620666077 - 2¹¹ = 620664029 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620666047) 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, 7569058 + ... + 7569139.

It is an arithmetic number, because the mean of its divisors is an integer number (158951079).

Almost surely, 2^620666077 is an apocalyptic number.

It is an amenable number.

620666077 is a deficient number, since it is larger than the sum of its proper divisors (15138239).

620666077 is a wasteful number, since it uses less digits than its factorization.

620666077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15138238.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 620666077 is about 24913.1707536395. The cubic root of 620666077 is about 853.0071466357.

The spelling of 620666077 in words is "six hundred twenty million, six hundred sixty-six thousand, seventy-seven".