89781279 has 16 divisors (see below), whose sum is σ = 139603200. Its totient is φ = 51303000.

The previous prime is 89781271. The next prime is 89781281. The reversal of 89781279 is 97218798.

It is not a de Polignac number, because 89781279 - 2³ = 89781271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89781271) 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, 42597 + ... + 44654.

It is an arithmetic number, because the mean of its divisors is an integer number (8725200).

Almost surely, 2^89781279 is an apocalyptic number.

89781279 is a deficient number, since it is larger than the sum of its proper divisors (49821921).

89781279 is an equidigital number, since it uses as much as digits as its factorization.

89781279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87275 (or 87261 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 89781279 is about 9475.2983594186. The cubic root of 89781279 is about 447.7771515367. Note that the first 3 decimals are identical.

The spelling of 89781279 in words is "eighty-nine million, seven hundred eighty-one thousand, two hundred seventy-nine".