81329076 has 48 divisors (see below), whose sum is σ = 216007680. Its totient is φ = 26447040.

The previous prime is 81329069. The next prime is 81329077. The reversal of 81329076 is 67092318.

It is a super-2 number, since 2×81329076² = 13228837206027552, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81329076.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81329077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4756 + ... + 13611.

It is an arithmetic number, because the mean of its divisors is an integer number (4500160).

Almost surely, 2^81329076 is an apocalyptic number.

It is an amenable number.

81329076 is an abundant number, since it is smaller than the sum of its proper divisors (134678604).

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

81329076 is a wasteful number, since it uses less digits than its factorization.

81329076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18421 (or 18413 counting only the distinct ones).

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

The square root of 81329076 is about 9018.2634692051. The cubic root of 81329076 is about 433.2600173136.

The spelling of 81329076 in words is "eighty-one million, three hundred twenty-nine thousand, seventy-six".