620139757 has 2 divisors, whose sum is σ = 620139758. Its totient is φ = 620139756.

The previous prime is 620139733. The next prime is 620139791. The reversal of 620139757 is 757931026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601769961 + 18369796 = 24531^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 620139757 - 2¹¹ = 620137709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620136757) 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 as a sum of consecutive naturals, namely, 310069878 + 310069879.

It is an arithmetic number, because the mean of its divisors is an integer number (310069879).

Almost surely, 2^620139757 is an apocalyptic number.

It is an amenable number.

620139757 is a deficient number, since it is larger than the sum of its proper divisors (1).

620139757 is an equidigital number, since it uses as much as digits as its factorization.

620139757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 620139757 is about 24902.6054259389. The cubic root of 620139757 is about 852.7659639766.

The spelling of 620139757 in words is "six hundred twenty million, one hundred thirty-nine thousand, seven hundred fifty-seven".