1728732825 has 36 divisors (see below), whose sum is σ = 3196247808. Its totient is φ = 892245600.

The previous prime is 1728732823. The next prime is 1728732847. The reversal of 1728732825 is 5282378271.

It is not a de Polignac number, because 1728732825 - 2¹ = 1728732823 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1728732823) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 116949 + ... + 130898.

Almost surely, 2^1728732825 is an apocalyptic number.

1728732825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1728732825 is a deficient number, since it is larger than the sum of its proper divisors (1467514983).

1728732825 is a wasteful number, since it uses less digits than its factorization.

1728732825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247894 (or 247886 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 1728732825 is about 41578.0329621304. The cubic root of 1728732825 is about 1200.1696114422.

The spelling of 1728732825 in words is "one billion, seven hundred twenty-eight million, seven hundred thirty-two thousand, eight hundred twenty-five".