1728032820340 has 12 divisors (see below), whose sum is σ = 3628868922756. Its totient is φ = 691213128128.

The previous prime is 1728032820329. The next prime is 1728032820347. The reversal of 1728032820340 is 430282308271.

It can be written as a sum of positive squares in 2 ways, for example, as 226854069264 + 1501178751076 = 476292^2 + 1225226^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1728032820293 and 1728032820302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728032820347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43200820489 + ... + 43200820528.

It is an arithmetic number, because the mean of its divisors is an integer number (302405743563).

Almost surely, 2^{1728032820340} is an apocalyptic number.

1728032820340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1728032820340 is an abundant number, since it is smaller than the sum of its proper divisors (1900836102416).

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

1728032820340 is a wasteful number, since it uses less digits than its factorization.

1728032820340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86401641026 (or 86401641024 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 1728032820340 in words is "one trillion, seven hundred twenty-eight billion, thirty-two million, eight hundred twenty thousand, three hundred forty".