89471781 has 24 divisors (see below), whose sum is σ = 148075200. Its totient is φ = 50996736.

The previous prime is 89471761. The next prime is 89471783. The reversal of 89471781 is 18717498.

It is not a de Polignac number, because 89471781 - 2⁹ = 89471269 is a prime.

It is a super-2 number, since 2×89471781² = 16010399190623922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89471783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26706 + ... + 29868.

It is an arithmetic number, because the mean of its divisors is an integer number (6169800).

Almost surely, 2^89471781 is an apocalyptic number.

It is an amenable number.

89471781 is a deficient number, since it is larger than the sum of its proper divisors (58603419).

89471781 is a wasteful number, since it uses less digits than its factorization.

89471781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625 (or 3622 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 89471781 is about 9458.9524261411. The cubic root of 89471781 is about 447.2620267549.

The spelling of 89471781 in words is "eighty-nine million, four hundred seventy-one thousand, seven hundred eighty-one".