278220320000 has 720 divisors, whose sum is σ = 834451390080. Its totient is φ = 90574848000.

The previous prime is 278220319997. The next prime is 278220320011. The reversal of 278220320000 is 23022872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2552479946 + ... + 2552480054.

It is an arithmetic number, because the mean of its divisors is an integer number (1158960264).

Almost surely, 2^278220320000 is an apocalyptic number.

278220320000 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 278220320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (417225695040).

278220320000 is an abundant number, since it is smaller than the sum of its proper divisors (556231070080).

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

278220320000 is an equidigital number, since it uses as much as digits as its factorization.

278220320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

Adding to 278220320000 its reverse (23022872), we get a palindrome (278243342872).

The spelling of 278220320000 in words is "two hundred seventy-eight billion, two hundred twenty million, three hundred twenty thousand".