81716726 has 16 divisors (see below), whose sum is σ = 150861984. Its totient is φ = 32327424.

The previous prime is 81716699. The next prime is 81716749. The reversal of 81716726 is 62761718.

It is a super-3 number, since 3×81716726³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81716726.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224315 + ... + 224678.

It is an arithmetic number, because the mean of its divisors is an integer number (9428874).

Almost surely, 2^81716726 is an apocalyptic number.

81716726 is a deficient number, since it is larger than the sum of its proper divisors (69145258).

81716726 is a wasteful number, since it uses less digits than its factorization.

81716726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449015.

The product of its digits is 28224, while the sum is 38.

The square root of 81716726 is about 9039.7304163343. The cubic root of 81716726 is about 433.9472955175.

The spelling of 81716726 in words is "eighty-one million, seven hundred sixteen thousand, seven hundred twenty-six".