81934679 has 6 divisors (see below), whose sum is σ = 87038184. Its totient is φ = 77114720.

The previous prime is 81934667. The next prime is 81934693. The reversal of 81934679 is 97643918.

It is not a de Polignac number, because 81934679 - 2⁴ = 81934663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81934609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141467 + ... + 142044.

It is an arithmetic number, because the mean of its divisors is an integer number (14506364).

Almost surely, 2^81934679 is an apocalyptic number.

81934679 is a deficient number, since it is larger than the sum of its proper divisors (5103505).

81934679 is a wasteful number, since it uses less digits than its factorization.

81934679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283545 (or 283528 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 81934679 is about 9051.7776707120. Note that the first 3 decimals coincide. The cubic root of 81934679 is about 434.3327578196.

The spelling of 81934679 in words is "eighty-one million, nine hundred thirty-four thousand, six hundred seventy-nine".