1728199836 has 72 divisors (see below), whose sum is σ = 4790049264. Its totient is φ = 521015040.

The previous prime is 1728199831. The next prime is 1728199859. The reversal of 1728199836 is 6389918271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728199831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66936 + ... + 89088.

It is an arithmetic number, because the mean of its divisors is an integer number (66528462).

Almost surely, 2^1728199836 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 1728199836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2395024632).

1728199836 is an abundant number, since it is smaller than the sum of its proper divisors (3061849428).

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

1728199836 is a wasteful number, since it uses less digits than its factorization.

1728199836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22371 (or 22366 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1728199836 is about 41571.6229656721. The cubic root of 1728199836 is about 1200.0462565503.

The spelling of 1728199836 in words is "one billion, seven hundred twenty-eight million, one hundred ninety-nine thousand, eight hundred thirty-six".