1720128575550 has 192 divisors, whose sum is σ = 5335660781568. Its totient is φ = 356279280000.

The previous prime is 1720128575531. The next prime is 1720128575573. The reversal of 1720128575550 is 555758210271.

It is a self number, because there is not a number n which added to its sum of digits gives 1720128575550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3352615 + ... + 3831485.

It is an arithmetic number, because the mean of its divisors is an integer number (27789899904).

Almost surely, 2^{1720128575550} is an apocalyptic number.

1720128575550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720128575550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667830390784).

1720128575550 is an abundant number, since it is smaller than the sum of its proper divisors (3615532206018).

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

1720128575550 is a wasteful number, since it uses less digits than its factorization.

1720128575550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479215 (or 479210 counting only the distinct ones).

The product of its (nonzero) digits is 980000, while the sum is 48.

The spelling of 1720128575550 in words is "one trillion, seven hundred twenty billion, one hundred twenty-eight million, five hundred seventy-five thousand, five hundred fifty".