81679118 has 32 divisors (see below), whose sum is σ = 136468800. Its totient is φ = 36467200.

The previous prime is 81679111. The next prime is 81679139. The reversal of 81679118 is 81197618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81679111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116168 + ... + 116868.

It is an arithmetic number, because the mean of its divisors is an integer number (4264650).

Almost surely, 2^81679118 is an apocalyptic number.

81679118 is a deficient number, since it is larger than the sum of its proper divisors (54789682).

81679118 is a wasteful number, since it uses less digits than its factorization.

81679118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its digits is 24192, while the sum is 41.

The square root of 81679118 is about 9037.6500264173. The cubic root of 81679118 is about 433.8807143130.

The spelling of 81679118 in words is "eighty-one million, six hundred seventy-nine thousand, one hundred eighteen".