1781992128 has 112 divisors (see below), whose sum is σ = 5405347584. Its totient is φ = 507540480.

The previous prime is 1781992109. The next prime is 1781992133. The reversal of 1781992128 is 8212991871.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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, 464458 + ... + 468278.

It is an arithmetic number, because the mean of its divisors is an integer number (48262032).

Almost surely, 2^1781992128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1781992128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2702673792).

1781992128 is an abundant number, since it is smaller than the sum of its proper divisors (3623355456).

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

1781992128 is a wasteful number, since it uses less digits than its factorization.

1781992128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4180 counting only the distinct ones).

The product of its digits is 145152, while the sum is 48.

The square root of 1781992128 is about 42213.6485985279. The cubic root of 1781992128 is about 1212.3702209628.

The spelling of 1781992128 in words is "one billion, seven hundred eighty-one million, nine hundred ninety-two thousand, one hundred twenty-eight".