81020076 has 48 divisors (see below), whose sum is σ = 198046464. Its totient is φ = 25730496.

The previous prime is 81020033. The next prime is 81020077. The reversal of 81020076 is 67002018.

It is not an unprimeable number, because it can be changed into a prime (81020077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102555 + ... + 103341.

It is an arithmetic number, because the mean of its divisors is an integer number (4125968).

Almost surely, 2^81020076 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81020076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99023232).

81020076 is an abundant number, since it is smaller than the sum of its proper divisors (117026388).

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

81020076 is a wasteful number, since it uses less digits than its factorization.

81020076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81020076 is about 9001.1152642325. The cubic root of 81020076 is about 432.7106145620.

The spelling of 81020076 in words is "eighty-one million, twenty thousand, seventy-six".