81226673 has 4 divisors (see below), whose sum is σ = 88610928. Its totient is φ = 73842420.

The previous prime is 81226667. The next prime is 81226693. The reversal of 81226673 is 37662218.

It is a happy number.

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 81226673 - 2¹² = 81222577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81226633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3692111 + ... + 3692132.

It is an arithmetic number, because the mean of its divisors is an integer number (22152732).

Almost surely, 2^81226673 is an apocalyptic number.

It is an amenable number.

81226673 is a deficient number, since it is larger than the sum of its proper divisors (7384255).

81226673 is a wasteful number, since it uses less digits than its factorization.

81226673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7384254.

The product of its digits is 24192, while the sum is 35.

The square root of 81226673 is about 9012.5841466252. The cubic root of 81226673 is about 433.0780989398.

The spelling of 81226673 in words is "eighty-one million, two hundred twenty-six thousand, six hundred seventy-three".