620780689 has 2 divisors, whose sum is σ = 620780690. Its totient is φ = 620780688.

The previous prime is 620780663. The next prime is 620780701. The reversal of 620780689 is 986087026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547934464 + 72846225 = 23408^2 + 8535^2 .

It is a cyclic number.

It is not a de Polignac number, because 620780689 - 2¹³ = 620772497 is a prime.

It is not a weakly prime, because it can be changed into another prime (620780389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310390344 + 310390345.

It is an arithmetic number, because the mean of its divisors is an integer number (310390345).

Almost surely, 2^620780689 is an apocalyptic number.

It is an amenable number.

620780689 is a deficient number, since it is larger than the sum of its proper divisors (1).

620780689 is an equidigital number, since it uses as much as digits as its factorization.

620780689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 620780689 is about 24915.4708765458. The cubic root of 620780689 is about 853.0596487468.

The spelling of 620780689 in words is "six hundred twenty million, seven hundred eighty thousand, six hundred eighty-nine".