620780621 has 2 divisors, whose sum is σ = 620780622. Its totient is φ = 620780620.

The previous prime is 620780599. The next prime is 620780651. The reversal of 620780621 is 126087026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407474596 + 213306025 = 20186^2 + 14605^2 .

It is a cyclic number.

It is not a de Polignac number, because 620780621 - 2¹⁴ = 620764237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620780651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310390310 + 310390311.

It is an arithmetic number, because the mean of its divisors is an integer number (310390311).

Almost surely, 2^620780621 is an apocalyptic number.

It is an amenable number.

620780621 is a deficient number, since it is larger than the sum of its proper divisors (1).

620780621 is an equidigital number, since it uses as much as digits as its factorization.

620780621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 620780621 is about 24915.4695119317. The cubic root of 620780621 is about 853.0596175988.

The spelling of 620780621 in words is "six hundred twenty million, seven hundred eighty thousand, six hundred twenty-one".