89128281 has 16 divisors (see below), whose sum is σ = 134112960. Its totient is φ = 52153920.

The previous prime is 89128279. The next prime is 89128321. The reversal of 89128281 is 18282198.

It is not a de Polignac number, because 89128281 - 2¹ = 89128279 is a prime.

It is a super-2 number, since 2×89128281² = 15887700948029922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89128211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45610 + ... + 47523.

It is an arithmetic number, because the mean of its divisors is an integer number (8382060).

Almost surely, 2^89128281 is an apocalyptic number.

It is an amenable number.

89128281 is a deficient number, since it is larger than the sum of its proper divisors (44984679).

89128281 is a wasteful number, since it uses less digits than its factorization.

89128281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93176.

The product of its digits is 18432, while the sum is 39.

The square root of 89128281 is about 9440.7775633154. Note that the first 3 decimals coincide. The cubic root of 89128281 is about 446.6889166783.

The spelling of 89128281 in words is "eighty-nine million, one hundred twenty-eight thousand, two hundred eighty-one".