81266847 has 8 divisors (see below), whose sum is σ = 108406656. Its totient is φ = 54152472.

The previous prime is 81266831. The next prime is 81266849. The reversal of 81266847 is 74866218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81266847 - 2⁴ = 81266831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81266799 and 81266808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81266849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3118 + ... + 13124.

It is an arithmetic number, because the mean of its divisors is an integer number (13550832).

Almost surely, 2^81266847 is an apocalyptic number.

81266847 is a deficient number, since it is larger than the sum of its proper divisors (27139809).

81266847 is a wasteful number, since it uses less digits than its factorization.

81266847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12717.

The product of its digits is 129024, while the sum is 42.

The square root of 81266847 is about 9014.8126436438. The cubic root of 81266847 is about 433.1494860483.

The spelling of 81266847 in words is "eighty-one million, two hundred sixty-six thousand, eight hundred forty-seven".