81376918 has 16 divisors (see below), whose sum is σ = 139670784. Its totient is φ = 34833960.

The previous prime is 81376877. The next prime is 81376931. The reversal of 81376918 is 81967318.

It is a congruent 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, 10533 + ... + 16543.

It is an arithmetic number, because the mean of its divisors is an integer number (8729424).

Almost surely, 2^81376918 is an apocalyptic number.

81376918 is a deficient number, since it is larger than the sum of its proper divisors (58293866).

81376918 is a wasteful number, since it uses less digits than its factorization.

81376918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6987.

The product of its digits is 72576, while the sum is 43.

The square root of 81376918 is about 9020.9155854603. The cubic root of 81376918 is about 433.3449560328.

The spelling of 81376918 in words is "eighty-one million, three hundred seventy-six thousand, nine hundred eighteen".