289288660 has 24 divisors (see below), whose sum is σ = 643242600. Its totient is φ = 108908544.

The previous prime is 289288639. The next prime is 289288663. The reversal of 289288660 is 66882982.

It can be written as a sum of positive squares in 4 ways, for example, as 38763076 + 250525584 = 6226^2 + 15828^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289288663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425085 + ... + 425764.

It is an arithmetic number, because the mean of its divisors is an integer number (26801775).

Almost surely, 2^289288660 is an apocalyptic number.

289288660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

289288660 is an abundant number, since it is smaller than the sum of its proper divisors (353953940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

289288660 is a wasteful number, since it uses less digits than its factorization.

289288660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850875 (or 850873 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 289288660 is about 17008.4878810552. The cubic root of 289288660 is about 661.3689522914.

The spelling of 289288660 in words is "two hundred eighty-nine million, two hundred eighty-eight thousand, six hundred sixty".