81854716 has 24 divisors (see below), whose sum is σ = 145113696. Its totient is φ = 40397760.

The previous prime is 81854713. The next prime is 81854761. The reversal of 81854716 is 61745818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81854713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120570 + ... + 121246.

It is an arithmetic number, because the mean of its divisors is an integer number (6046404).

Almost surely, 2^81854716 is an apocalyptic number.

It is an amenable number.

81854716 is a deficient number, since it is larger than the sum of its proper divisors (63258980).

81854716 is a wasteful number, since it uses less digits than its factorization.

81854716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1027 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 81854716 is about 9047.3596148269. The cubic root of 81854716 is about 434.1914181771.

The spelling of 81854716 in words is "eighty-one million, eight hundred fifty-four thousand, seven hundred sixteen".