289855689985 has 24 divisors (see below), whose sum is σ = 370587817080. Its totient is φ = 217596309504.

The previous prime is 289855689961. The next prime is 289855690001. The reversal of 289855689985 is 589986558982.

It can be written as a sum of positive squares in 12 ways, for example, as 42997754881 + 246857935104 = 207359^2 + 496848^2 .

It is not a de Polignac number, because 289855689985 - 2⁷ = 289855689857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 289855689899 and 289855689908.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189351 + ... + 784579.

It is an arithmetic number, because the mean of its divisors is an integer number (15441159045).

Almost surely, 2^289855689985 is an apocalyptic number.

It is an amenable number.

289855689985 is a deficient number, since it is larger than the sum of its proper divisors (80732127095).

289855689985 is a wasteful number, since it uses less digits than its factorization.

289855689985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595605 (or 595588 counting only the distinct ones).

The product of its digits is 4478976000, while the sum is 82.

The spelling of 289855689985 in words is "two hundred eighty-nine billion, eight hundred fifty-five million, six hundred eighty-nine thousand, nine hundred eighty-five".