81729603 has 12 divisors (see below), whose sum is σ = 123186960. Its totient is φ = 52117296.

The previous prime is 81729601. The next prime is 81729611. The reversal of 81729603 is 30692718.

It is not a de Polignac number, because 81729603 - 2¹ = 81729601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81729601) 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 11 ways as a sum of consecutive naturals, for example, 197208 + ... + 197621.

It is an arithmetic number, because the mean of its divisors is an integer number (10265580).

Almost surely, 2^81729603 is an apocalyptic number.

81729603 is a deficient number, since it is larger than the sum of its proper divisors (41457357).

81729603 is a wasteful number, since it uses less digits than its factorization.

81729603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394858 (or 394855 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81729603 is about 9040.4426329688. The cubic root of 81729603 is about 433.9700882639.

The spelling of 81729603 in words is "eighty-one million, seven hundred twenty-nine thousand, six hundred three".