1728731396 has 48 divisors (see below), whose sum is σ = 3527803776. Its totient is φ = 725946624.

The previous prime is 1728731357. The next prime is 1728731401. The reversal of 1728731396 is 6931378271.

It is a super-2 number, since 2×1728731396² = 5977024479032217632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1728731396.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318215 + ... + 323601.

It is an arithmetic number, because the mean of its divisors is an integer number (73495912).

Almost surely, 2^1728731396 is an apocalyptic number.

It is an amenable number.

1728731396 is an abundant number, since it is smaller than the sum of its proper divisors (1799072380).

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

1728731396 is a wasteful number, since it uses less digits than its factorization.

1728731396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628 (or 5626 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 1728731396 is about 41578.0157775717. The cubic root of 1728731396 is about 1200.1692807485.

The spelling of 1728731396 in words is "one billion, seven hundred twenty-eight million, seven hundred thirty-one thousand, three hundred ninety-six".