1728418725 has 72 divisors (see below), whose sum is σ = 3389416992. Its totient is φ = 834998400.

The previous prime is 1728418711. The next prime is 1728418729. The reversal of 1728418725 is 5278148271.

It is not a de Polignac number, because 1728418725 - 2⁴ = 1728418709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728418729) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 783474 + ... + 785676.

It is an arithmetic number, because the mean of its divisors is an integer number (47075236).

Almost surely, 2^1728418725 is an apocalyptic number.

1728418725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1728418725 is a deficient number, since it is larger than the sum of its proper divisors (1660998267).

1728418725 is a wasteful number, since it uses less digits than its factorization.

1728418725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547 (or 2539 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1728418725 is about 41574.2555555719. The cubic root of 1728418725 is about 1200.0969192553.

The spelling of 1728418725 in words is "one billion, seven hundred twenty-eight million, four hundred eighteen thousand, seven hundred twenty-five".