1728342440 has 64 divisors (see below), whose sum is σ = 4250439360. Its totient is φ = 627281920.

The previous prime is 1728342437. The next prime is 1728342457. The reversal of 1728342440 is 442438271.

It is a self number, because there is not a number n which added to its sum of digits gives 1728342440.

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, 244232 + ... + 251208.

It is an arithmetic number, because the mean of its divisors is an integer number (66413115).

Almost surely, 2^1728342440 is an apocalyptic number.

1728342440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1728342440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2125219680).

1728342440 is an abundant number, since it is smaller than the sum of its proper divisors (2522096920).

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

1728342440 is a wasteful number, since it uses less digits than its factorization.

1728342440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562 (or 7558 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 1728342440 is about 41573.3380906561. The cubic root of 1728342440 is about 1200.0792632828.

The spelling of 1728342440 in words is "one billion, seven hundred twenty-eight million, three hundred forty-two thousand, four hundred forty".