289989664438 has 4 divisors (see below), whose sum is σ = 434984496660. Its totient is φ = 144994832218.

The previous prime is 289989664379. The next prime is 289989664439. The reversal of 289989664438 is 834466989982.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289989664439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72497416108 + ... + 72497416111.

It is an arithmetic number, because the mean of its divisors is an integer number (108746124165).

Almost surely, 2^289989664438 is an apocalyptic number.

289989664438 is a deficient number, since it is larger than the sum of its proper divisors (144994832222).

289989664438 is a wasteful number, since it uses less digits than its factorization.

289989664438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144994832221.

The product of its digits is 1289945088, while the sum is 76.

The spelling of 289989664438 in words is "two hundred eighty-nine billion, nine hundred eighty-nine million, six hundred sixty-four thousand, four hundred thirty-eight".