2778280 has 16 divisors (see below), whose sum is σ = 6251220. Its totient is φ = 1111296.

The previous prime is 2778277. The next prime is 2778299. The reversal of 2778280 is 828772.

2778280 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 2553604 + 224676 = 1598^2 + 474^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34689 + ... + 34768.

2^2778280 is an apocalyptic number.

2778280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2778280 is an abundant number, since it is smaller than the sum of its proper divisors (3472940).

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

2778280 is a wasteful number, since it uses less digits than its factorization.

2778280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69468 (or 69464 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 2778280 is about 1666.8173265238. The cubic root of 2778280 is about 140.5805821857.

The spelling of 2778280 in words is "two million, seven hundred seventy-eight thousand, two hundred eighty".