289209228 has 192 divisors, whose sum is σ = 894136320. Its totient is φ = 70560000.

The previous prime is 289209223. The next prime is 289209247. The reversal of 289209228 is 822902982.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 289209228.

It is not an unprimeable number, because it can be changed into a prime (289209223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1152103 + ... + 1152353.

It is an arithmetic number, because the mean of its divisors is an integer number (4656960).

Almost surely, 2^289209228 is an apocalyptic number.

289209228 is a gapful number since it is divisible by the number (28) 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 289209228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447068160).

289209228 is an abundant number, since it is smaller than the sum of its proper divisors (604927092).

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

289209228 is a wasteful number, since it uses less digits than its factorization.

289209228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 289209228 is about 17006.1526513201. The cubic root of 289209228 is about 661.3084145255.

The spelling of 289209228 in words is "two hundred eighty-nine million, two hundred nine thousand, two hundred twenty-eight".