81162578 has 8 divisors (see below), whose sum is σ = 139135872. Its totient is φ = 34783956.

The previous prime is 81162569. The next prime is 81162581. The reversal of 81162578 is 87526118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2898650 + ... + 2898677.

It is an arithmetic number, because the mean of its divisors is an integer number (17391984).

Almost surely, 2^81162578 is an apocalyptic number.

81162578 is a deficient number, since it is larger than the sum of its proper divisors (57973294).

81162578 is a wasteful number, since it uses less digits than its factorization.

81162578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5797336.

The product of its digits is 26880, while the sum is 38.

The square root of 81162578 is about 9009.0275834854. The cubic root of 81162578 is about 432.9641567082.

The spelling of 81162578 in words is "eighty-one million, one hundred sixty-two thousand, five hundred seventy-eight".