278442020 has 48 divisors (see below), whose sum is σ = 605075520. Its totient is φ = 107547264.

The previous prime is 278442007. The next prime is 278442023. The reversal of 278442020 is 20244872.

It is not an unprimeable number, because it can be changed into a prime (278442023) 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, 101507 + ... + 104213.

It is an arithmetic number, because the mean of its divisors is an integer number (12605740).

Almost surely, 2^278442020 is an apocalyptic number.

278442020 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 278442020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302537760).

278442020 is an abundant number, since it is smaller than the sum of its proper divisors (326633500).

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

278442020 is a wasteful number, since it uses less digits than its factorization.

278442020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 278442020 is about 16686.5820346768. The cubic root of 278442020 is about 652.9976102668.

Adding to 278442020 its reverse (20244872), we get a palindrome (298686892).

The spelling of 278442020 in words is "two hundred seventy-eight million, four hundred forty-two thousand, twenty".