81308944 has 20 divisors (see below), whose sum is σ = 157864896. Its totient is φ = 40569632.

The previous prime is 81308917. The next prime is 81308971. The reversal of 81308944 is 44980318.

It is an interprime number because it is at equal distance from previous prime (81308917) and next prime (81308971).

It is a super-2 number, since 2×81308944² = 13222288748790272, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2997 + ... + 13099.

Almost surely, 2^81308944 is an apocalyptic number.

It is an amenable number.

81308944 is a deficient number, since it is larger than the sum of its proper divisors (76555952).

81308944 is a wasteful number, since it uses less digits than its factorization.

81308944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10614 (or 10608 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 81308944 is about 9017.1472207123. The cubic root of 81308944 is about 433.2242649894.

The spelling of 81308944 in words is "eighty-one million, three hundred eight thousand, nine hundred forty-four".