1728870907 has 4 divisors (see below), whose sum is σ = 1728954496. Its totient is φ = 1728787320.

The previous prime is 1728870901. The next prime is 1728870937. The reversal of 1728870907 is 7090788271.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7090788271 = 7 ⋅1012969753.

It is a cyclic number.

It is not a de Polignac number, because 1728870907 - 2¹¹ = 1728868859 is a prime.

It is a super-2 number, since 2×1728870907² = 5977989226142005298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1728870901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14557 + ... + 60577.

It is an arithmetic number, because the mean of its divisors is an integer number (432238624).

Almost surely, 2^1728870907 is an apocalyptic number.

1728870907 is a deficient number, since it is larger than the sum of its proper divisors (83589).

1728870907 is an equidigital number, since it uses as much as digits as its factorization.

1728870907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83588.

The product of its (nonzero) digits is 395136, while the sum is 49.

The square root of 1728870907 is about 41579.6934452384. The cubic root of 1728870907 is about 1200.2015649837.

The spelling of 1728870907 in words is "one billion, seven hundred twenty-eight million, eight hundred seventy thousand, nine hundred seven".