81329088 has 56 divisors (see below), whose sum is σ = 227850192. Its totient is φ = 25513984.

The previous prime is 81329077. The next prime is 81329107. The reversal of 81329088 is 88092318.

It is a super-2 number, since 2×81329088² = 13228841109823488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9195 + ... + 15722.

Almost surely, 2^81329088 is an apocalyptic number.

It is an amenable number.

81329088 is an abundant number, since it is smaller than the sum of its proper divisors (146521104).

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

81329088 is a wasteful number, since it uses less digits than its factorization.

81329088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24949 (or 24939 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 81329088 is about 9018.2641345217. The cubic root of 81329088 is about 433.2600386226.

The spelling of 81329088 in words is "eighty-one million, three hundred twenty-nine thousand, eighty-eight".