620728689 has 16 divisors (see below), whose sum is σ = 995655680. Its totient is φ = 336033360.

The previous prime is 620728681. The next prime is 620728699. The reversal of 620728689 is 986827026.

It is a happy number.

It is not a de Polignac number, because 620728689 - 2³ = 620728681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620728681) 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 in 15 ways as a sum of consecutive naturals, for example, 777457 + ... + 778254.

It is an arithmetic number, because the mean of its divisors is an integer number (62228480).

Almost surely, 2^620728689 is an apocalyptic number.

It is an amenable number.

620728689 is a deficient number, since it is larger than the sum of its proper divisors (374926991).

620728689 is a wasteful number, since it uses less digits than its factorization.

620728689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555740.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 620728689 is about 24914.4273263505. The cubic root of 620728689 is about 853.0358290945.

The spelling of 620728689 in words is "six hundred twenty million, seven hundred twenty-eight thousand, six hundred eighty-nine".