81167474 has 8 divisors (see below), whose sum is σ = 121806720. Its totient is φ = 40565236.

The previous prime is 81167417. The next prime is 81167477. The reversal of 81167474 is 47476118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81167477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2894 + ... + 13065.

It is an arithmetic number, because the mean of its divisors is an integer number (15225840).

Almost surely, 2^81167474 is an apocalyptic number.

81167474 is a deficient number, since it is larger than the sum of its proper divisors (40639246).

81167474 is a wasteful number, since it uses less digits than its factorization.

81167474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18504.

The product of its digits is 37632, while the sum is 38.

The square root of 81167474 is about 9009.2993068274. The cubic root of 81167474 is about 432.9728624850.

The spelling of 81167474 in words is "eighty-one million, one hundred sixty-seven thousand, four hundred seventy-four".