1728872732805 has 32 divisors (see below), whose sum is σ = 2855591224320. Its totient is φ = 892270563840.

The previous prime is 1728872732771. The next prime is 1728872732903. The reversal of 1728872732805 is 5082372788271.

It is a happy number.

It is not a de Polignac number, because 1728872732805 - 2¹⁹ = 1728872208517 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8882409 + ... + 9074961.

It is an arithmetic number, because the mean of its divisors is an integer number (89237225760).

Almost surely, 2^{1728872732805} is an apocalyptic number.

1728872732805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1728872732805 is a deficient number, since it is larger than the sum of its proper divisors (1126718491515).

1728872732805 is a wasteful number, since it uses less digits than its factorization.

1728872732805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211901.

The product of its (nonzero) digits is 21073920, while the sum is 60.

The spelling of 1728872732805 in words is "one trillion, seven hundred twenty-eight billion, eight hundred seventy-two million, seven hundred thirty-two thousand, eight hundred five".