64628825769 has 12 divisors (see below), whose sum is σ = 93358029492. Its totient is φ = 43083446400.

The previous prime is 64628825749. The next prime is 64628825791. The reversal of 64628825769 is 96752882646.

64628825769 is a `hidden beast` number, since 6 + 46 + 288 + 257 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61250310144 + 3378515625 = 247488^2 + 58125^2 .

It is not a de Polignac number, because 64628825769 - 2⁹ = 64628825257 is a prime.

It is a super-2 number, since 2×64628825769² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64628825749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27172 + ... + 360549.

It is an arithmetic number, because the mean of its divisors is an integer number (7779835791).

Almost surely, 2^64628825769 is an apocalyptic number.

It is an amenable number.

64628825769 is a deficient number, since it is larger than the sum of its proper divisors (28729203723).

64628825769 is a wasteful number, since it uses less digits than its factorization.

64628825769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406248 (or 406245 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 64628825769 in words is "sixty-four billion, six hundred twenty-eight million, eight hundred twenty-five thousand, seven hundred sixty-nine".