1728391672 has 32 divisors (see below), whose sum is σ = 3864729600. Its totient is φ = 708532704.

The previous prime is 1728391667. The next prime is 1728391681. The reversal of 1728391672 is 2761938271.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 669672 + ... + 672247.

It is an arithmetic number, because the mean of its divisors is an integer number (120772800).

Almost surely, 2^1728391672 is an apocalyptic number.

It is an amenable number.

1728391672 is an abundant number, since it is smaller than the sum of its proper divisors (2136337928).

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

1728391672 is a wasteful number, since it uses less digits than its factorization.

1728391672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341955 (or 1341951 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 1728391672 is about 41573.9301966990. The cubic root of 1728391672 is about 1200.0906579656.

The spelling of 1728391672 in words is "one billion, seven hundred twenty-eight million, three hundred ninety-one thousand, six hundred seventy-two".