27875975521 has 9 divisors (see below), whose sum is σ = 28050192561. Its totient is φ = 27702836964.

The previous prime is 27875975507. The next prime is 27875975531. The reversal of 27875975521 is 12557957872.

It is a happy number.

The square root of 27875975521 is 166961.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 27875975521 - 2⁹ = 27875975009 is a prime.

It is a super-2 number, since 2×27875975521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27875975531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33224820 + ... + 33225658.

Almost surely, 2^27875975521 is an apocalyptic number.

27875975521 is the 166961-st square number.

27875975521 is the 83481-st centered octagonal number.

It is an amenable number.

27875975521 is a deficient number, since it is larger than the sum of its proper divisors (174217040).

27875975521 is an frugal number, since it uses more digits than its factorization.

27875975521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076 (or 1038 counting only the distinct ones).

The product of its digits is 12348000, while the sum is 58.

The spelling of 27875975521 in words is "twenty-seven billion, eight hundred seventy-five million, nine hundred seventy-five thousand, five hundred twenty-one".