81107378 has 16 divisors (see below), whose sum is σ = 132871104. Its totient is φ = 36825360.

The previous prime is 81107339. The next prime is 81107393. The reversal of 81107378 is 87370118.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26651 + ... + 29537.

It is an arithmetic number, because the mean of its divisors is an integer number (8304444).

Almost surely, 2^81107378 is an apocalyptic number.

81107378 is a deficient number, since it is larger than the sum of its proper divisors (51763726).

81107378 is a wasteful number, since it uses less digits than its factorization.

81107378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4177.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 81107378 is about 9005.9634687245. The cubic root of 81107378 is about 432.8659791068.

The spelling of 81107378 in words is "eighty-one million, one hundred seven thousand, three hundred seventy-eight".