81135674 has 16 divisors (see below), whose sum is σ = 127258560. Its totient is φ = 38723520.

The previous prime is 81135667. The next prime is 81135689. The reversal of 81135674 is 47653118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24722 + ... + 27810.

It is an arithmetic number, because the mean of its divisors is an integer number (7953660).

Almost surely, 2^81135674 is an apocalyptic number.

81135674 is a deficient number, since it is larger than the sum of its proper divisors (46122886).

81135674 is a wasteful number, since it uses less digits than its factorization.

81135674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685.

The product of its digits is 20160, while the sum is 35.

The square root of 81135674 is about 9007.5342908034. The cubic root of 81135674 is about 432.9163113617.

The spelling of 81135674 in words is "eighty-one million, one hundred thirty-five thousand, six hundred seventy-four".