81264717 has 12 divisors (see below), whose sum is σ = 117544284. Its totient is φ = 54101760.

The previous prime is 81264713. The next prime is 81264721. The reversal of 81264717 is 71746218.

81264717 is a `hidden beast` number, since 8 + 1 + 2 + 647 + 1 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (81264713) and next prime (81264721).

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 60933636 = 4509^2 + 7806^2 .

It is not a de Polignac number, because 81264717 - 2² = 81264713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81264713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1117 + ... + 12797.

It is an arithmetic number, because the mean of its divisors is an integer number (9795357).

Almost surely, 2^81264717 is an apocalyptic number.

It is an amenable number.

81264717 is a deficient number, since it is larger than the sum of its proper divisors (36279567).

81264717 is a wasteful number, since it uses less digits than its factorization.

81264717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12460 (or 12457 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 81264717 is about 9014.6945039752. The cubic root of 81264717 is about 433.1457017397.

The spelling of 81264717 in words is "eighty-one million, two hundred sixty-four thousand, seven hundred seventeen".