81159674 has 32 divisors (see below), whose sum is σ = 129392640. Its totient is φ = 38127600.

The previous prime is 81159653. The next prime is 81159679. The reversal of 81159674 is 47695118.

It is not an unprimeable number, because it can be changed into a prime (81159679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453317 + ... + 453495.

It is an arithmetic number, because the mean of its divisors is an integer number (4043520).

Almost surely, 2^81159674 is an apocalyptic number.

81159674 is a deficient number, since it is larger than the sum of its proper divisors (48232966).

81159674 is a wasteful number, since it uses less digits than its factorization.

81159674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its digits is 60480, while the sum is 41.

The square root of 81159674 is about 9008.8664103759. The cubic root of 81159674 is about 432.9589928221.

The spelling of 81159674 in words is "eighty-one million, one hundred fifty-nine thousand, six hundred seventy-four".