1728161445 has 16 divisors (see below), whose sum is σ = 2765669760. Its totient is φ = 921482304.

The previous prime is 1728161441. The next prime is 1728161453. The reversal of 1728161445 is 5441618271.

1728161445 is a nontrivial binomial coefficient, being equal to C(58791, 2).

It is not a de Polignac number, because 1728161445 - 2² = 1728161441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728161441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78387 + ... + 97983.

It is an arithmetic number, because the mean of its divisors is an integer number (172854360).

Almost surely, 2^1728161445 is an apocalyptic number.

1728161445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1728161445 is the 58790-th triangular number.

It is an amenable number.

1728161445 is a deficient number, since it is larger than the sum of its proper divisors (1037508315).

1728161445 is a wasteful number, since it uses less digits than its factorization.

1728161445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25484.

The product of its digits is 53760, while the sum is 39.

The square root of 1728161445 is about 41571.1612178443. The cubic root of 1728161445 is about 1200.0373703640.

The spelling of 1728161445 in words is "one billion, seven hundred twenty-eight million, one hundred sixty-one thousand, four hundred forty-five".