289738887 has 16 divisors (see below), whose sum is σ = 394323840. Its totient is φ = 189189792.

The previous prime is 289738853. The next prime is 289738909. The reversal of 289738887 is 788837982.

It is a de Polignac number, because none of the positive numbers 2^k-289738887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 289738887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289738817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31953 + ... + 40005.

It is an arithmetic number, because the mean of its divisors is an integer number (24645240).

Almost surely, 2^289738887 is an apocalyptic number.

289738887 is a deficient number, since it is larger than the sum of its proper divisors (104584953).

289738887 is a wasteful number, since it uses less digits than its factorization.

289738887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8302.

The product of its digits is 10838016, while the sum is 60.

The square root of 289738887 is about 17021.7180977714. The cubic root of 289738887 is about 661.7118759985.

The spelling of 289738887 in words is "two hundred eighty-nine million, seven hundred thirty-eight thousand, eight hundred eighty-seven".