81363712 has 18 divisors (see below), whose sum is σ = 162410108. Its totient is φ = 40681728.

The previous prime is 81363677. The next prime is 81363713. The reversal of 81363712 is 21736318.

It is not an unprimeable number, because it can be changed into a prime (81363713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158658 + ... + 159169.

Almost surely, 2^81363712 is an apocalyptic number.

It is an amenable number.

81363712 is a deficient number, since it is larger than the sum of its proper divisors (81046396).

81363712 is an equidigital number, since it uses as much as digits as its factorization.

81363712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317843 (or 317829 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 81363712 is about 9020.1835901494. The cubic root of 81363712 is about 433.3215134186.

The spelling of 81363712 in words is "eighty-one million, three hundred sixty-three thousand, seven hundred twelve".