81703418 has 16 divisors (see below), whose sum is σ = 125389824. Its totient is φ = 39916800.

The previous prime is 81703417. The next prime is 81703441. The reversal of 81703418 is 81430718.

It is not an unprimeable number, because it can be changed into a prime (81703417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14618 + ... + 19418.

It is an arithmetic number, because the mean of its divisors is an integer number (7836864).

Almost surely, 2^81703418 is an apocalyptic number.

81703418 is a deficient number, since it is larger than the sum of its proper divisors (43686406).

81703418 is a wasteful number, since it uses less digits than its factorization.

81703418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4997.

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

The square root of 81703418 is about 9038.9943024653. The cubic root of 81703418 is about 433.9237373697.

The spelling of 81703418 in words is "eighty-one million, seven hundred three thousand, four hundred eighteen".