77850486289 has 9 divisors (see below), whose sum is σ = 80022031761. Its totient is φ = 75736374480.

The previous prime is 77850486271. The next prime is 77850486293. The reversal of 77850486289 is 98268405877.

The square root of 77850486289 is 279017.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 13950225 + 77836536064 = 3735^2 + 278992^2 .

It is not a de Polignac number, because 77850486289 - 2¹¹ = 77850484241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77850486289.

It is not an unprimeable number, because it can be changed into a prime (77850486269) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10319859 + ... + 10327399.

Almost surely, 2^77850486289 is an apocalyptic number.

77850486289 is the 279017-th square number.

77850486289 is the 139509-th centered octagonal number.

It is an amenable number.

77850486289 is a deficient number, since it is larger than the sum of its proper divisors (2171545472).

77850486289 is an frugal number, since it uses more digits than its factorization.

77850486289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15156 (or 7578 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 64.

Multiplying 77850486289 by its sum of digits (64), we get a square (4982431122496 = 2232136²).

The spelling of 77850486289 in words is "seventy-seven billion, eight hundred fifty million, four hundred eighty-six thousand, two hundred eighty-nine".