1912885720128 has 84 divisors (see below), whose sum is σ = 5686013489520. Its totient is φ = 637628568192.

The previous prime is 1912885720099. The next prime is 1912885720177. The reversal of 1912885720128 is 8210275882191.

It is a happy number.

1912885720128 is a `hidden beast` number, since 1 + 91 + 288 + 57 + 201 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61484118 + ... + 61515221.

It is an arithmetic number, because the mean of its divisors is an integer number (67690636780).

Almost surely, 2^{1912885720128} is an apocalyptic number.

1912885720128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1912885720128 is an abundant number, since it is smaller than the sum of its proper divisors (3773127769392).

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

1912885720128 is an equidigital number, since it uses as much as digits as its factorization.

1912885720128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122999366 (or 122999344 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 54.

The spelling of 1912885720128 in words is "one trillion, nine hundred twelve billion, eight hundred eighty-five million, seven hundred twenty thousand, one hundred twenty-eight".