81341768 has 32 divisors (see below), whose sum is σ = 158008320. Its totient is φ = 39216000.

The previous prime is 81341761. The next prime is 81341791. The reversal of 81341768 is 86714318.

It is not an unprimeable number, because it can be changed into a prime (81341761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106508 + ... + 107268.

It is an arithmetic number, because the mean of its divisors is an integer number (4937760).

Almost surely, 2^81341768 is an apocalyptic number.

It is an amenable number.

81341768 is a deficient number, since it is larger than the sum of its proper divisors (76666552).

81341768 is a wasteful number, since it uses less digits than its factorization.

81341768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1225 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 81341768 is about 9018.9671248985. The cubic root of 81341768 is about 433.2825539445.

The spelling of 81341768 in words is "eighty-one million, three hundred forty-one thousand, seven hundred sixty-eight".