81529308 has 48 divisors (see below), whose sum is σ = 241570560. Its totient is φ = 23293872.

The previous prime is 81529303. The next prime is 81529313. The reversal of 81529308 is 80392518.

It is an interprime number because it is at equal distance from previous prime (81529303) and next prime (81529313).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81529303) 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 15 ways as a sum of consecutive naturals, for example, 53166 + ... + 54677.

It is an arithmetic number, because the mean of its divisors is an integer number (5032720).

Almost surely, 2^81529308 is an apocalyptic number.

It is an amenable number.

81529308 is an abundant number, since it is smaller than the sum of its proper divisors (160041252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81529308 is a wasteful number, since it uses less digits than its factorization.

81529308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107863 (or 107855 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 81529308 is about 9029.3581167213. The cubic root of 81529308 is about 433.6152876402.

The spelling of 81529308 in words is "eighty-one million, five hundred twenty-nine thousand, three hundred eight".