81845074 has 8 divisors (see below), whose sum is σ = 123235200. Its totient is φ = 40766676.

The previous prime is 81845069. The next prime is 81845081. The reversal of 81845074 is 47054818.

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

It is a super-2 number, since 2×81845074² = 13397232276130952, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77274 + ... + 78325.

It is an arithmetic number, because the mean of its divisors is an integer number (15404400).

Almost surely, 2^81845074 is an apocalyptic number.

81845074 is a deficient number, since it is larger than the sum of its proper divisors (41390126).

81845074 is a wasteful number, since it uses less digits than its factorization.

81845074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155864.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 81845074 is about 9046.8267364861. The cubic root of 81845074 is about 434.1743691165.

The spelling of 81845074 in words is "eighty-one million, eight hundred forty-five thousand, seventy-four".