1728220253 has 6 divisors (see below), whose sum is σ = 1806627774. Its totient is φ = 1653079736.

The previous prime is 1728220231. The next prime is 1728220261. The reversal of 1728220253 is 3520228271.

It can be written as a sum of positive squares in only one way, i.e., 1468269124 + 259951129 = 38318^2 + 16123^2 .

It is not a de Polignac number, because 1728220253 - 2⁶ = 1728220189 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 (1728220453) 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, 1632950 + ... + 1634007.

It is an arithmetic number, because the mean of its divisors is an integer number (301104629).

Almost surely, 2^1728220253 is an apocalyptic number.

It is an amenable number.

1728220253 is a deficient number, since it is larger than the sum of its proper divisors (78407521).

1728220253 is an equidigital number, since it uses as much as digits as its factorization.

1728220253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267003 (or 3266980 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1728220253 is about 41571.8685290907. The cubic root of 1728220253 is about 1200.0509823247.

The spelling of 1728220253 in words is "one billion, seven hundred twenty-eight million, two hundred twenty thousand, two hundred fifty-three".