2778228 has 36 divisors (see below), whose sum is σ = 7074340. Its totient is φ = 919296.

The previous prime is 2778227. The next prime is 2778233. The reversal of 2778228 is 8228772.

It can be written as a sum of positive squares in 2 ways, for example, as 1774224 + 1004004 = 1332^2 + 1002^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2778192 and 2778201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8076 + ... + 8412.

2^2778228 is an apocalyptic number.

It is an amenable number.

2778228 is an abundant number, since it is smaller than the sum of its proper divisors (4296112).

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

2778228 is a wasteful number, since it uses less digits than its factorization.

2778228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 571 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 2778228 is about 1666.8017278609. The cubic root of 2778228 is about 140.5797051159.

The spelling of 2778228 in words is "two million, seven hundred seventy-eight thousand, two hundred twenty-eight".