81546128 has 20 divisors (see below), whose sum is σ = 161358720. Its totient is φ = 39905184.

The previous prime is 81546107. The next prime is 81546131. The reversal of 81546128 is 82164518.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53468 + ... + 54971.

It is an arithmetic number, because the mean of its divisors is an integer number (8067936).

Almost surely, 2^81546128 is an apocalyptic number.

It is an amenable number.

81546128 is a deficient number, since it is larger than the sum of its proper divisors (79812592).

81546128 is a wasteful number, since it uses less digits than its factorization.

81546128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108494 (or 108488 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 81546128 is about 9030.2894748729. The cubic root of 81546128 is about 433.6451047608.

The spelling of 81546128 in words is "eighty-one million, five hundred forty-six thousand, one hundred twenty-eight".