1728816 has 20 divisors (see below), whose sum is σ = 4466232. Its totient is φ = 576256.

The previous prime is 1728809. The next prime is 1728821. The reversal of 1728816 is 6188271.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17961 + ... + 18056.

2^1728816 is an apocalyptic number.

1728816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1728816 is an abundant number, since it is smaller than the sum of its proper divisors (2737416).

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

1728816 is a wasteful number, since it uses less digits than its factorization.

1728816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36028 (or 36022 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 1728816 is about 1314.8444774953. The cubic root of 1728816 is about 120.0188859164.

The spelling of 1728816 in words is "one million, seven hundred twenty-eight thousand, eight hundred sixteen".