1228767828 has 48 divisors (see below), whose sum is σ = 2974082496. Its totient is φ = 394571520.

The previous prime is 1228767821. The next prime is 1228767851. The reversal of 1228767828 is 8287678221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228767821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21358 + ... + 53978.

It is an arithmetic number, because the mean of its divisors is an integer number (61960052).

Almost surely, 2^1228767828 is an apocalyptic number.

It is an amenable number.

1228767828 is an abundant number, since it is smaller than the sum of its proper divisors (1745314668).

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

1228767828 is a wasteful number, since it uses less digits than its factorization.

1228767828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32744 (or 32742 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 51.

The square root of 1228767828 is about 35053.7847885218. The cubic root of 1228767828 is about 1071.0833723950.

The spelling of 1228767828 in words is "one billion, two hundred twenty-eight million, seven hundred sixty-seven thousand, eight hundred twenty-eight".