289278 has 32 divisors (see below), whose sum is σ = 702720. Its totient is φ = 87480.

The previous prime is 289273. The next prime is 289283. The reversal of 289278 is 872982.

It is an interprime number because it is at equal distance from previous prime (289273) and next prime (289283).

It is a super-2 number, since 2×289278² = 167363522568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289273) by changing a digit.

289278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351 + ... + 837.

It is an arithmetic number, because the mean of its divisors is an integer number (21960).

2²⁸⁹²⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351360).

289278 is an abundant number, since it is smaller than the sum of its proper divisors (413442).

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

289278 is a wasteful number, since it uses less digits than its factorization.

289278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 503 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 289278 is about 537.8457027810. The cubic root of 289278 is about 66.1360828595.

The spelling of 289278 in words is "two hundred eighty-nine thousand, two hundred seventy-eight".