1728235738551 has 32 divisors (see below), whose sum is σ = 2638623375360. Its totient is φ = 985643396064.

The previous prime is 1728235738513. The next prime is 1728235738571. The reversal of 1728235738551 is 1558375328271.

It is a happy number.

It is not a de Polignac number, because 1728235738551 - 2¹¹ = 1728235736503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1728235738491 and 1728235738500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728235738571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119156766 + ... + 119171268.

It is an arithmetic number, because the mean of its divisors is an integer number (82456980480).

Almost surely, 2^{1728235738551} is an apocalyptic number.

1728235738551 is a deficient number, since it is larger than the sum of its proper divisors (910387636809).

1728235738551 is a wasteful number, since it uses less digits than its factorization.

1728235738551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25155.

The product of its digits is 14112000, while the sum is 57.

The spelling of 1728235738551 in words is "one trillion, seven hundred twenty-eight billion, two hundred thirty-five million, seven hundred thirty-eight thousand, five hundred fifty-one".