1728731444 has 12 divisors (see below), whose sum is σ = 3300305568. Its totient is φ = 785787000.

The previous prime is 1728731437. The next prime is 1728731449. The reversal of 1728731444 is 4441378271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728731449) 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, 19644632 + ... + 19644719.

It is an arithmetic number, because the mean of its divisors is an integer number (275025464).

Almost surely, 2^1728731444 is an apocalyptic number.

It is an amenable number.

1728731444 is a deficient number, since it is larger than the sum of its proper divisors (1571574124).

1728731444 is a wasteful number, since it uses less digits than its factorization.

1728731444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39289366 (or 39289364 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 1728731444 is about 41578.0163547998. The cubic root of 1728731444 is about 1200.1692918565.

The spelling of 1728731444 in words is "one billion, seven hundred twenty-eight million, seven hundred thirty-one thousand, four hundred forty-four".