1728723156 has 24 divisors (see below), whose sum is σ = 4039998144. Its totient is φ = 575339520.

The previous prime is 1728723133. The next prime is 1728723169. The reversal of 1728723156 is 6513278271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104680 + ... + 120063.

It is an arithmetic number, because the mean of its divisors is an integer number (168333256).

Almost surely, 2^1728723156 is an apocalyptic number.

It is an amenable number.

1728723156 is an abundant number, since it is smaller than the sum of its proper divisors (2311274988).

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

1728723156 is a wasteful number, since it uses less digits than its factorization.

1728723156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225391 (or 225389 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 1728723156 is about 41577.9166866258. The cubic root of 1728723156 is about 1200.1673738761.

The spelling of 1728723156 in words is "one billion, seven hundred twenty-eight million, seven hundred twenty-three thousand, one hundred fifty-six".