278341340 has 48 divisors (see below), whose sum is σ = 620579232. Its totient is φ = 104503296.

The previous prime is 278341339. The next prime is 278341351. The reversal of 278341340 is 43143872.

It is a junction number, because it is equal to n+sod(n) for n = 278341297 and 278341306.

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, 157904 + ... + 159656.

It is an arithmetic number, because the mean of its divisors is an integer number (12928734).

Almost surely, 2^278341340 is an apocalyptic number.

278341340 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 278341340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310289616).

278341340 is an abundant number, since it is smaller than the sum of its proper divisors (342237892).

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

278341340 is a wasteful number, since it uses less digits than its factorization.

278341340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246 (or 2244 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 278341340 is about 16683.5649667570. The cubic root of 278341340 is about 652.9188964231.

The spelling of 278341340 in words is "two hundred seventy-eight million, three hundred forty-one thousand, three hundred forty".