81068578 has 8 divisors (see below), whose sum is σ = 122408640. Its totient is φ = 40265700.

The previous prime is 81068549. The next prime is 81068579. The reversal of 81068578 is 87586018.

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

It is a super-2 number, since 2×81068578² = 13144228677884168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81068579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133918 + ... + 134521.

It is an arithmetic number, because the mean of its divisors is an integer number (15301080).

Almost surely, 2^81068578 is an apocalyptic number.

81068578 is a deficient number, since it is larger than the sum of its proper divisors (41340062).

81068578 is a wasteful number, since it uses less digits than its factorization.

81068578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268592.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 81068578 is about 9003.8090828271. The cubic root of 81068578 is about 432.7969435507.

The spelling of 81068578 in words is "eighty-one million, sixty-eight thousand, five hundred seventy-eight".