1220384538648 has 96 divisors (see below), whose sum is σ = 3795454353600. Its totient is φ = 350349624000.

The previous prime is 1220384538643. The next prime is 1220384538683. The reversal of 1220384538648 is 8468354830221.

1220384538648 is a `hidden beast` number, since 1 + 2 + 20 + 3 + 84 + 538 + 6 + 4 + 8 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1220384538594 and 1220384538603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220384538643) 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 23 ways as a sum of consecutive naturals, for example, 40534678 + ... + 40564773.

It is an arithmetic number, because the mean of its divisors is an integer number (39535982850).

Almost surely, 2^{1220384538648} is an apocalyptic number.

1220384538648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1220384538648 is an abundant number, since it is smaller than the sum of its proper divisors (2575069814952).

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

1220384538648 is a wasteful number, since it uses less digits than its factorization.

1220384538648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81099493 (or 81099486 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 1220384538648 in words is "one trillion, two hundred twenty billion, three hundred eighty-four million, five hundred thirty-eight thousand, six hundred forty-eight".