1263516228 has 288 divisors, whose sum is σ = 3874590720. Its totient is φ = 343388160.

The previous prime is 1263516227. The next prime is 1263516251. The reversal of 1263516228 is 8226153621.

1263516228 is a `hidden beast` number, since 1 + 2 + 635 + 16 + 2 + 2 + 8 = 666.

1263516228 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 = 1263516192 and 1263516201.

It is not an unprimeable number, because it can be changed into a prime (1263516227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11591838 + ... + 11591946.

It is an arithmetic number, because the mean of its divisors is an integer number (13453440).

Almost surely, 2^1263516228 is an apocalyptic number.

1263516228 is a gapful number since it is divisible by the number (18) 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 1263516228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1937295360).

1263516228 is an abundant number, since it is smaller than the sum of its proper divisors (2611074492).

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

1263516228 is a wasteful number, since it uses less digits than its factorization.

1263516228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 222 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1263516228 is about 35545.9734428528. The cubic root of 1263516228 is about 1081.0860782251.

Adding to 1263516228 its reverse (8226153621), we get a palindrome (9489669849).

The spelling of 1263516228 in words is "one billion, two hundred sixty-three million, five hundred sixteen thousand, two hundred twenty-eight".