81344076 has 24 divisors (see below), whose sum is σ = 207057984. Its totient is φ = 24649680.

The previous prime is 81344071. The next prime is 81344117. The reversal of 81344076 is 67044318.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81344071) 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 7 ways as a sum of consecutive naturals, for example, 307990 + ... + 308253.

It is an arithmetic number, because the mean of its divisors is an integer number (8627416).

Almost surely, 2^81344076 is an apocalyptic number.

It is an amenable number.

81344076 is an abundant number, since it is smaller than the sum of its proper divisors (125713908).

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

81344076 is a wasteful number, since it uses less digits than its factorization.

81344076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616261 (or 616259 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 81344076 is about 9019.0950765584. The cubic root of 81344076 is about 433.2866519076.

The spelling of 81344076 in words is "eighty-one million, three hundred forty-four thousand, seventy-six".