1728651253 has 6 divisors (see below), whose sum is σ = 2010880086. Its totient is φ = 1481701032.

The previous prime is 1728651193. The next prime is 1728651257. The reversal of 1728651253 is 3521568271.

It can be written as a sum of positive squares in only one way, i.e., 1716693489 + 11957764 = 41433^2 + 3458^2 .

It is not a de Polignac number, because 1728651253 - 2¹³ = 1728643061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728651257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17639250 + ... + 17639347.

It is an arithmetic number, because the mean of its divisors is an integer number (335146681).

Almost surely, 2^1728651253 is an apocalyptic number.

It is an amenable number.

1728651253 is a deficient number, since it is larger than the sum of its proper divisors (282228833).

1728651253 is an equidigital number, since it uses as much as digits as its factorization.

1728651253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35278611 (or 35278604 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 1728651253 is about 41577.0519998713. The cubic root of 1728651253 is about 1200.1507340745.

The spelling of 1728651253 in words is "one billion, seven hundred twenty-eight million, six hundred fifty-one thousand, two hundred fifty-three".