289251220 has 48 divisors (see below), whose sum is σ = 655724160. Its totient is φ = 106848896.

The previous prime is 289251211. The next prime is 289251233. The reversal of 289251220 is 22152982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2499 + ... + 24181.

It is an arithmetic number, because the mean of its divisors is an integer number (13660920).

Almost surely, 2^289251220 is an apocalyptic number.

289251220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289251220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327862080).

289251220 is an abundant number, since it is smaller than the sum of its proper divisors (366472940).

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

289251220 is a wasteful number, since it uses less digits than its factorization.

289251220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21744 (or 21742 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 289251220 is about 17007.3872185001. The cubic root of 289251220 is about 661.3404194045.

The spelling of 289251220 in words is "two hundred eighty-nine million, two hundred fifty-one thousand, two hundred twenty".