81073818 has 32 divisors (see below), whose sum is σ = 205902720. Its totient is φ = 23163840.

The previous prime is 81073813. The next prime is 81073841. The reversal of 81073818 is 81837018.

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 in 15 ways as a sum of consecutive naturals, for example, 106863 + ... + 107618.

It is an arithmetic number, because the mean of its divisors is an integer number (6434460).

Almost surely, 2^81073818 is an apocalyptic number.

81073818 is an abundant number, since it is smaller than the sum of its proper divisors (124828902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81073818 is a wasteful number, since it uses less digits than its factorization.

81073818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214499 (or 214493 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 81073818 is about 9004.1000660810. The cubic root of 81073818 is about 432.8062681956.

It can be divided in two parts, 810 and 73818, that multiplied together give a triangular number (59792580 = T₁₀₉₃₅).

The spelling of 81073818 in words is "eighty-one million, seventy-three thousand, eight hundred eighteen".