1228380215868 has 72 divisors (see below), whose sum is σ = 3398742424896. Its totient is φ = 371767017600.

The previous prime is 1228380215863. The next prime is 1228380215873. The reversal of 1228380215868 is 8685120838221.

1228380215868 is a `hidden beast` number, since 1 + 2 + 2 + 8 + 38 + 0 + 21 + 586 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1228380215863) and next prime (1228380215873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228380215863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21485748 + ... + 21542843.

Almost surely, 2^{1228380215868} is an apocalyptic number.

1228380215868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1228380215868 is an abundant number, since it is smaller than the sum of its proper divisors (2170362209028).

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

1228380215868 is a wasteful number, since it uses less digits than its factorization.

1228380215868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43028675 (or 43028670 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 54.

The spelling of 1228380215868 in words is "one trillion, two hundred twenty-eight billion, three hundred eighty million, two hundred fifteen thousand, eight hundred sixty-eight".