87532281 has 6 divisors (see below), whose sum is σ = 126435530. Its totient is φ = 58354848.

The previous prime is 87532271. The next prime is 87532307. The reversal of 87532281 is 18223578.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 8037225 = 8916^2 + 2835^2 .

It is not a de Polignac number, because 87532281 - 2⁷ = 87532153 is a prime.

It is a super-2 number, since 2×87532281² = 15323800434125922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87532271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4862896 + ... + 4862913.

Almost surely, 2^87532281 is an apocalyptic number.

It is an amenable number.

87532281 is a deficient number, since it is larger than the sum of its proper divisors (38903249).

87532281 is a wasteful number, since it uses less digits than its factorization.

87532281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9725815 (or 9725812 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 87532281 is about 9355.8687998496. The cubic root of 87532281 is about 444.0065892618.

The spelling of 87532281 in words is "eighty-seven million, five hundred thirty-two thousand, two hundred eighty-one".