289888666 has 8 divisors (see below), whose sum is σ = 435278304. Its totient is φ = 144795900.

The previous prime is 289888663. The next prime is 289888691. The reversal of 289888666 is 666888982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (289888663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71760 + ... + 75691.

It is an arithmetic number, because the mean of its divisors is an integer number (54409788).

Almost surely, 2^289888666 is an apocalyptic number.

289888666 is a deficient number, since it is larger than the sum of its proper divisors (145389638).

289888666 is a wasteful number, since it uses less digits than its factorization.

289888666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148436.

The product of its digits is 15925248, while the sum is 61.

The square root of 289888666 is about 17026.1171733311. The cubic root of 289888666 is about 661.8258791857.

The spelling of 289888666 in words is "two hundred eighty-nine million, eight hundred eighty-eight thousand, six hundred sixty-six".