1728125420825 has 48 divisors (see below), whose sum is σ = 2240131027200. Its totient is φ = 1321165278720.

The previous prime is 1728125420807. The next prime is 1728125420839. The reversal of 1728125420825 is 5280245218271.

It is not a de Polignac number, because 1728125420825 - 2¹² = 1728125416729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 1728125420825.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275307587 + ... + 275313863.

It is an arithmetic number, because the mean of its divisors is an integer number (46669396400).

Almost surely, 2^{1728125420825} is an apocalyptic number.

It is an amenable number.

1728125420825 is a deficient number, since it is larger than the sum of its proper divisors (512005606375).

1728125420825 is a wasteful number, since it uses less digits than its factorization.

1728125420825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11826 (or 11821 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 47.

The spelling of 1728125420825 in words is "one trillion, seven hundred twenty-eight billion, one hundred twenty-five million, four hundred twenty thousand, eight hundred twenty-five".