620780663 has 2 divisors, whose sum is σ = 620780664. Its totient is φ = 620780662.

The previous prime is 620780651. The next prime is 620780689. The reversal of 620780663 is 366087026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620780663 - 2⁶ = 620780599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620780063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310390331 + 310390332.

It is an arithmetic number, because the mean of its divisors is an integer number (310390332).

Almost surely, 2^620780663 is an apocalyptic number.

620780663 is a deficient number, since it is larger than the sum of its proper divisors (1).

620780663 is an equidigital number, since it uses as much as digits as its factorization.

620780663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 620780663 is about 24915.4703547816. The cubic root of 620780663 is about 853.0596368373.

The spelling of 620780663 in words is "six hundred twenty million, seven hundred eighty thousand, six hundred sixty-three".