12780228 has 12 divisors (see below), whose sum is σ = 29820560. Its totient is φ = 4260072.

The previous prime is 12780223. The next prime is 12780247. The reversal of 12780228 is 82208721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-4 number, since 4×12780228⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12780195 and 12780204.

It is not an unprimeable number, because it can be changed into a prime (12780221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532498 + ... + 532521.

Almost surely, 2^12780228 is an apocalyptic number.

It is an amenable number.

12780228 is an abundant number, since it is smaller than the sum of its proper divisors (17040332).

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

12780228 is a wasteful number, since it uses less digits than its factorization.

12780228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065026 (or 1065024 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 12780228 is about 3574.9444750933. The cubic root of 12780228 is about 233.8009118230.

Adding to 12780228 its reverse (82208721), we get a palindrome (94988949).

The spelling of 12780228 in words is "twelve million, seven hundred eighty thousand, two hundred twenty-eight".