81714866 has 16 divisors (see below), whose sum is σ = 127013400. Its totient is φ = 39381888.

The previous prime is 81714859. The next prime is 81714931. The reversal of 81714866 is 66841718.

It can be written as a sum of positive squares in 4 ways, for example, as 80550625 + 1164241 = 8975^2 + 1079^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62750 + ... + 64038.

Almost surely, 2^81714866 is an apocalyptic number.

81714866 is a deficient number, since it is larger than the sum of its proper divisors (45298534).

81714866 is a wasteful number, since it uses less digits than its factorization.

81714866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413.

The product of its digits is 64512, while the sum is 41.

The square root of 81714866 is about 9039.6275365747. The cubic root of 81714866 is about 433.9440030537.

The spelling of 81714866 in words is "eighty-one million, seven hundred fourteen thousand, eight hundred sixty-six".