80991876 has 96 divisors (see below), whose sum is σ = 234178560. Its totient is φ = 21256704.

The previous prime is 80991839. The next prime is 80991877. The reversal of 80991876 is 67819908.

It is a happy number.

It is a super-3 number, since 3×80991876³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (80991877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60745 + ... + 62063.

It is an arithmetic number, because the mean of its divisors is an integer number (2439360).

Almost surely, 2^80991876 is an apocalyptic number.

80991876 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80991876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117089280).

80991876 is an abundant number, since it is smaller than the sum of its proper divisors (153186684).

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

80991876 is a wasteful number, since it uses less digits than its factorization.

80991876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 80991876 is about 8999.5486553493. The cubic root of 80991876 is about 432.6604053796.

The spelling of 80991876 in words is "eighty million, nine hundred ninety-one thousand, eight hundred seventy-six".