81529733 has 8 divisors (see below), whose sum is σ = 86470656. Its totient is φ = 76705200.

The previous prime is 81529709. The next prime is 81529751. The reversal of 81529733 is 33792518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81529733 - 2²² = 77335429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81529793) 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, 27653 + ... + 30458.

It is an arithmetic number, because the mean of its divisors is an integer number (10808832).

Almost surely, 2^81529733 is an apocalyptic number.

It is an amenable number.

81529733 is a deficient number, since it is larger than the sum of its proper divisors (4940923).

81529733 is a wasteful number, since it uses less digits than its factorization.

81529733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58195.

The product of its digits is 45360, while the sum is 38.

The square root of 81529733 is about 9029.3816510324. The cubic root of 81529733 is about 433.6160410959.

The spelling of 81529733 in words is "eighty-one million, five hundred twenty-nine thousand, seven hundred thirty-three".