81456686 has 16 divisors (see below), whose sum is σ = 128860800. Its totient is φ = 38511288.

The previous prime is 81456677. The next prime is 81456689. The reversal of 81456686 is 68665418.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81456689) 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, 21791 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (8053800).

Almost surely, 2^81456686 is an apocalyptic number.

81456686 is a deficient number, since it is larger than the sum of its proper divisors (47404114).

81456686 is a wasteful number, since it uses less digits than its factorization.

81456686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103.

The product of its digits is 276480, while the sum is 44.

The square root of 81456686 is about 9025.3357832271. The cubic root of 81456686 is about 433.4865021981.

The spelling of 81456686 in words is "eighty-one million, four hundred fifty-six thousand, six hundred eighty-six".