1228626828 has 144 divisors (see below), whose sum is σ = 3738282912. Its totient is φ = 335232000.

The previous prime is 1228626827. The next prime is 1228626853. The reversal of 1228626828 is 8286268221.

1228626828 is a `hidden beast` number, since 12 + 2 + 8 + 626 + 8 + 2 + 8 = 666.

1228626828 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1228626821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208158 + ... + 213978.

It is an arithmetic number, because the mean of its divisors is an integer number (25960298).

Almost surely, 2^1228626828 is an apocalyptic number.

1228626828 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 1228626828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1869141456).

1228626828 is an abundant number, since it is smaller than the sum of its proper divisors (2509656084).

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

1228626828 is a wasteful number, since it uses less digits than its factorization.

1228626828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896 (or 5891 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 1228626828 is about 35051.7735357285. The cubic root of 1228626828 is about 1071.0424022109.

The spelling of 1228626828 in words is "one billion, two hundred twenty-eight million, six hundred twenty-six thousand, eight hundred twenty-eight".