1728622613 has 6 divisors (see below), whose sum is σ = 1761546582. Its totient is φ = 1695710120.

The previous prime is 1728622601. The next prime is 1728622619. The reversal of 1728622613 is 3162268271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1598160529 + 130462084 = 39977^2 + 11422^2 .

It is not a de Polignac number, because 1728622613 - 2³⁰ = 654880789 is a prime.

It is a super-2 number, since 2×1728622613² = 5976272276349895538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728622619) 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, 299828 + ... + 305538.

It is an arithmetic number, because the mean of its divisors is an integer number (293591097).

Almost surely, 2^1728622613 is an apocalyptic number.

It is an amenable number.

1728622613 is a deficient number, since it is larger than the sum of its proper divisors (32923969).

1728622613 is an frugal number, since it uses more digits than its factorization.

1728622613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11475 (or 5764 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 1728622613 is about 41576.7075776810. The cubic root of 1728622613 is about 1200.1441060735.

The spelling of 1728622613 in words is "one billion, seven hundred twenty-eight million, six hundred twenty-two thousand, six hundred thirteen".