1728891891607 has 4 divisors (see below), whose sum is σ = 1728905376016. Its totient is φ = 1728878407200.

The previous prime is 1728891891589. The next prime is 1728891891641. The reversal of 1728891891607 is 7061981988271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1728891891607 - 2³¹ = 1726744407959 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 (1728891891677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6548019 + ... + 6806932.

It is an arithmetic number, because the mean of its divisors is an integer number (432226344004).

Almost surely, 2^{1728891891607} is an apocalyptic number.

1728891891607 is a deficient number, since it is larger than the sum of its proper divisors (13484409).

1728891891607 is a wasteful number, since it uses less digits than its factorization.

1728891891607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13484408.

The product of its (nonzero) digits is 24385536, while the sum is 67.

The spelling of 1728891891607 in words is "one trillion, seven hundred twenty-eight billion, eight hundred ninety-one million, eight hundred ninety-one thousand, six hundred seven".