81673227 has 6 divisors (see below), whose sum is σ = 117972452. Its totient is φ = 54448812.

The previous prime is 81673223. The next prime is 81673279. The reversal of 81673227 is 72237618.

It is not a de Polignac number, because 81673227 - 2² = 81673223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81673191 and 81673200.

It is not an unprimeable number, because it can be changed into a prime (81673223) 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, 4537393 + ... + 4537410.

Almost surely, 2^81673227 is an apocalyptic number.

81673227 is a deficient number, since it is larger than the sum of its proper divisors (36299225).

81673227 is a wasteful number, since it uses less digits than its factorization.

81673227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9074809 (or 9074806 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 81673227 is about 9037.3241061721. The cubic root of 81673227 is about 433.8702830351.

The spelling of 81673227 in words is "eighty-one million, six hundred seventy-three thousand, two hundred twenty-seven".