81086880 has 96 divisors (see below), whose sum is σ = 291924864. Its totient is φ = 18533376.

The previous prime is 81086861. The next prime is 81086893. The reversal of 81086880 is 8868018.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nialpdrome in base 14.

It is an unprimeable number.

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, 8707 + ... + 15426.

It is an arithmetic number, because the mean of its divisors is an integer number (3040884).

Almost surely, 2^81086880 is an apocalyptic number.

81086880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81086880 is an abundant number, since it is smaller than the sum of its proper divisors (210837984).

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

81086880 is a wasteful number, since it uses less digits than its factorization.

81086880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24158 (or 24150 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The square root of 81086880 is about 9004.8253730986. The cubic root of 81086880 is about 432.8295104376.

The spelling of 81086880 in words is "eighty-one million, eighty-six thousand, eight hundred eighty".