1728636 has 48 divisors (see below), whose sum is σ = 4967424. Its totient is φ = 455616.

The previous prime is 1728593. The next prime is 1728659. The reversal of 1728636 is 6368271.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1728597 and 1728606.

It is a congruent number.

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, 301 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (103488).

2^1728636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1728636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483712).

1728636 is an abundant number, since it is smaller than the sum of its proper divisors (3238788).

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

1728636 is a wasteful number, since it uses less digits than its factorization.

1728636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1608 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 1728636 is about 1314.7760265536. The cubic root of 1728636 is about 120.0147204164.

The spelling of 1728636 in words is "one million, seven hundred twenty-eight thousand, six hundred thirty-six".