279440880 has 80 divisors (see below), whose sum is σ = 868590240. Its totient is φ = 74317824.

The previous prime is 279440867. The next prime is 279440881. The reversal of 279440880 is 88044972.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279440881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102576 + ... + 105264.

It is an arithmetic number, because the mean of its divisors is an integer number (10857378).

Almost surely, 2^279440880 is an apocalyptic number.

279440880 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 279440880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434295120).

279440880 is an abundant number, since it is smaller than the sum of its proper divisors (589149360).

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

279440880 is a wasteful number, since it uses less digits than its factorization.

279440880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138 (or 3132 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 279440880 is about 16716.4852765167. The cubic root of 279440880 is about 653.7775150590. Note that the first 3 decimals are identical.

The spelling of 279440880 in words is "two hundred seventy-nine million, four hundred forty thousand, eight hundred eighty".