81073814 has 4 divisors (see below), whose sum is σ = 121610724. Its totient is φ = 40536906.

The previous prime is 81073813. The next prime is 81073841. The reversal of 81073814 is 41837018.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073813) by changing a digit.

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 as a sum of consecutive naturals, namely, 20268452 + ... + 20268455.

It is an arithmetic number, because the mean of its divisors is an integer number (30402681).

Almost surely, 2^81073814 is an apocalyptic number.

81073814 is a deficient number, since it is larger than the sum of its proper divisors (40536910).

81073814 is a wasteful number, since it uses less digits than its factorization.

81073814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40536909.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81073814 is about 9004.0998439600. The cubic root of 81073814 is about 432.8062610777.

The spelling of 81073814 in words is "eighty-one million, seventy-three thousand, eight hundred fourteen".