81072386 has 8 divisors (see below), whose sum is σ = 121960080. Its totient is φ = 40419028.

The previous prime is 81072379. The next prime is 81072403. The reversal of 81072386 is 68327018.

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

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, 57716 + ... + 59103.

It is an arithmetic number, because the mean of its divisors is an integer number (15245010).

Almost surely, 2^81072386 is an apocalyptic number.

81072386 is a deficient number, since it is larger than the sum of its proper divisors (40887694).

81072386 is a wasteful number, since it uses less digits than its factorization.

81072386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117168.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81072386 is about 9004.0205464004. The cubic root of 81072386 is about 432.8037199738.

The spelling of 81072386 in words is "eighty-one million, seventy-two thousand, three hundred eighty-six".