279228240 has 240 divisors, whose sum is σ = 995829120. Its totient is φ = 69995520.

The previous prime is 279228217. The next prime is 279228259. The reversal of 279228240 is 42822972.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 279228195 and 279228204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 897685 + ... + 897995.

It is an arithmetic number, because the mean of its divisors is an integer number (4149288).

Almost surely, 2^279228240 is an apocalyptic number.

279228240 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 279228240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497914560).

279228240 is an abundant number, since it is smaller than the sum of its proper divisors (716600880).

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

279228240 is a wasteful number, since it uses less digits than its factorization.

279228240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 279228240 is about 16710.1238774582. The cubic root of 279228240 is about 653.6116427310.

The spelling of 279228240 in words is "two hundred seventy-nine million, two hundred twenty-eight thousand, two hundred forty".