81329606304 has 48 divisors (see below), whose sum is σ = 213538314528. Its totient is φ = 27103761152.

The previous prime is 81329606243. The next prime is 81329606333. The reversal of 81329606304 is 40360692318.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×81329606304² (a number of 23 digits) contains 22 as substring.

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, 343354 + ... + 529670.

It is an arithmetic number, because the mean of its divisors is an integer number (4448714886).

Almost surely, 2^81329606304 is an apocalyptic number.

It is an amenable number.

81329606304 is an abundant number, since it is smaller than the sum of its proper divisors (132208708224).

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

81329606304 is a wasteful number, since it uses less digits than its factorization.

81329606304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190877 (or 190869 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 81329606304 in words is "eighty-one billion, three hundred twenty-nine million, six hundred six thousand, three hundred four".