89987281 has 4 divisors (see below), whose sum is σ = 91901952. Its totient is φ = 88072612.

The previous prime is 89987267. The next prime is 89987323. The reversal of 89987281 is 18278998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 89987281 - 2¹⁷ = 89856209 is a prime.

It is a super-2 number, since 2×89987281² = 16195421483545922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89987081) 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 3 ways as a sum of consecutive naturals, for example, 957265 + ... + 957358.

It is an arithmetic number, because the mean of its divisors is an integer number (22975488).

Almost surely, 2^89987281 is an apocalyptic number.

It is an amenable number.

89987281 is a deficient number, since it is larger than the sum of its proper divisors (1914671).

89987281 is a wasteful number, since it uses less digits than its factorization.

89987281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914670.

The product of its digits is 580608, while the sum is 52.

The square root of 89987281 is about 9486.1626066603. The cubic root of 89987281 is about 448.1193629253.

The spelling of 89987281 in words is "eighty-nine million, nine hundred eighty-seven thousand, two hundred eighty-one".