1728147987 has 16 divisors (see below), whose sum is σ = 2671534080. Its totient is φ = 1102007016.

The previous prime is 1728147973. The next prime is 1728148001. The reversal of 1728147987 is 7897418271.

1728147987 is a `hidden beast` number, since 17 + 2 + 81 + 479 + 87 = 666.

It is an interprime number because it is at equal distance from previous prime (1728147973) and next prime (1728148001).

It is not a de Polignac number, because 1728147987 - 2⁶ = 1728147923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1728147947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1390803 + ... + 1392044.

It is an arithmetic number, because the mean of its divisors is an integer number (166970880).

Almost surely, 2^1728147987 is an apocalyptic number.

1728147987 is a deficient number, since it is larger than the sum of its proper divisors (943386093).

1728147987 is a wasteful number, since it uses less digits than its factorization.

1728147987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782879 (or 2782873 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 1728147987 is about 41570.9993505088. Note that the first 3 decimals coincide. The cubic root of 1728147987 is about 1200.0342552721.

Adding to 1728147987 its sum of digits (54), we get a square (1728148041 = 41571²).

The spelling of 1728147987 in words is "one billion, seven hundred twenty-eight million, one hundred forty-seven thousand, nine hundred eighty-seven".