1720327642440 has 128 divisors (see below), whose sum is σ = 5688206536320. Its totient is φ = 412749619200.

The previous prime is 1720327642403. The next prime is 1720327642469. The reversal of 1720327642440 is 442467230271.

It is a junction number, because it is equal to n+sod(n) for n = 1720327642392 and 1720327642401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6589891 + ... + 6845970.

It is an arithmetic number, because the mean of its divisors is an integer number (44439113565).

Almost surely, 2^{1720327642440} is an apocalyptic number.

1720327642440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720327642440 is an abundant number, since it is smaller than the sum of its proper divisors (3967878893880).

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

1720327642440 is a wasteful number, since it uses less digits than its factorization.

1720327642440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13435983 (or 13435979 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 42.

The spelling of 1720327642440 in words is "one trillion, seven hundred twenty billion, three hundred twenty-seven million, six hundred forty-two thousand, four hundred forty".