81136706 has 16 divisors (see below), whose sum is σ = 139519680. Its totient is φ = 34665840.

The previous prime is 81136687. The next prime is 81136721. The reversal of 81136706 is 60763118.

It is a Curzon 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, 4121 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (8719980).

Almost surely, 2^81136706 is an apocalyptic number.

81136706 is a deficient number, since it is larger than the sum of its proper divisors (58382974).

81136706 is a wasteful number, since it uses less digits than its factorization.

81136706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17849.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 81136706 is about 9007.5915759985. The cubic root of 81136706 is about 432.9181468376.

The spelling of 81136706 in words is "eighty-one million, one hundred thirty-six thousand, seven hundred six".