2780226 has 24 divisors (see below), whose sum is σ = 6057324. Its totient is φ = 921600.

The previous prime is 2780209. The next prime is 2780233. The reversal of 2780226 is 6220872.

It can be written as a sum of positive squares in 2 ways, for example, as 2099601 + 680625 = 1449^2 + 825^2 .

It is a super-2 number, since 2×2780226² = 15459313222152, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2780226.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4326 + ... + 4926.

2^2780226 is an apocalyptic number.

2780226 is an abundant number, since it is smaller than the sum of its proper divisors (3277098).

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

2780226 is a wasteful number, since it uses less digits than its factorization.

2780226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 2780226 is about 1667.4009715722. The cubic root of 2780226 is about 140.6133969686.

The spelling of 2780226 in words is "two million, seven hundred eighty thousand, two hundred twenty-six".